CriticalCVE-2026-34486

Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor (CVE-2026-34486)

Published 09.04.2026Last modified 26.10.2026In CISA KEV since 04.08.2026Sources: SUSE, OSV, CVE.org, pwn.watch, Red Hat, EUVD, SingCERT, BSI

Actively exploited
Source: VulnCheck KEV (opens in a new tab), CSA/SingCERT How we classify
Public exploit

What is affected, what to do

The vulnerability is being actively exploited; treat it as a priority. The available sources name no fixed version. Check the vendor guidance in the references below. Immediate actions, mitigation and detection rules are in the runbook below.

Affected: Apache Tomcat eq 11.0.20..11.0.20
Apache Tomcat eq 10.1.53..10.1.53
Apache Tomcat eq 9.0.116..9.0.116

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

9.8

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

7.5

CVSS v3

Severity High on the scale from 0 to 10.

Source: SUSE, OSV, CVE.org, pwn.watch, Red Hat, EUVD, SingCERT, BSI

98.5 %

EPSS score

High — model estimates ≥ 50% chance of real-world exploitation within 30 days.

Source: FIRST EPSS, percentile 99.92

Show all metrics

Severity: Critical
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 233.49 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: actively exploitedSource: VulnCheck KEV (opens in a new tab), CSA/SingCERT How we classify
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 9.8 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.5
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 98.5 %; High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 99.92; Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: Actively exploited
Published: 09.04.2026
In CISA KEV since The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: 04.08.2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-311, CWE-807

Response and mitigation

Why act now?

Prioritisation rationale

This flaw is reachable over the network without authentication or user interaction. Its real weight comes from the CISA-documented chaining with CVE-2025-24813: bypassing session-replication encryption opens a path to injecting serialised data and ultimately to code execution. Exploitation likelihood is well above average. CISA does not flag ransomware use, but typical targets are internet-facing Java web applications and line-of-business systems running on Tomcat clusters. Treat clustered instances with a reachable Tribes port or an active file-based session store as emergency patches. Standalone instances without cluster configuration can follow in an expedited regular cycle.

01
Runbook step 1
Immediate response (0-24 h)
- Patch now: Upgrade Apache Tomcat to 11.0.21, 10.1.54 or 9.0.117. The advisory lists 11.0.20, 10.1.53 and 9.0.116 as affected. Those builds shipped the fix for CVE-2026-29146, so teams that recently patched for CVE-2026-29146 are likely exposed.
- RHEL hosts: Apply the fixed tomcat packages for Red Hat Enterprise Linux, including ELS/EUS streams. A patch is available from the vendor — look up the exact package version and RHSA ID in the Red Hat advisory. Confirm the installed version with rpm -q tomcat or $CATALINA_HOME/bin/version.sh.
- Inventory clustered instances: Find every instance with a <Cluster> element and EncryptInterceptor in server.xml, e.g. grep -R "EncryptInterceptor" $CATALINA_BASE/conf. Patch these first, since session-replication encryption is the control being bypassed.
- Break the CVE-2025-24813 chain: Confirm the DefaultServlet is not writable (readonly=true) and that partial PUT is disabled (allowPartialPut=false). Verify your patch level for CVE-2025-24813 as well.
- Lock down cluster ports: Restrict the Tribes receiver port (Tomcat default 4000/TCP, range 4000-4100) and multicast membership (default 228.0.0.4:45564/UDP) to cluster node IPs via host firewall immediately.
02
Runbook step 2
Mitigation layers
- Network segmentation: Carry replication traffic only on a dedicated cluster VLAN. Drop 4000-4100/TCP and 45564/UDP at segment and perimeter boundaries from client and DMZ networks.
- Transport encryption independent of the interceptor: Tribes has no native TLS. As a compensating control, wrap node-to-node links in IPsec or WireGuard so a bypassed EncryptInterceptor does not expose cleartext session data.
- Configuration hardening: Remove the Cluster block where session replication isn't needed. Disable PersistentManager with FileStore unless it is essential, because it is a precondition for the CVE-2025-24813 deserialisation path. Add a JVM deserialisation filter (-Djdk.serialFilter=..., JEP 290) that allowlists your session attribute classes.
- WAF/IPS: Block HTTP PUT requests carrying a Content-Range header to Tomcat apps where not business-required. Also block requests whose JSESSIONID contains path separators or leading dots.
- Least privilege / endpoint: Run Tomcat under a dedicated non-privileged service account. Minimise write access to webapps/ and work/, and restrict egress from Tomcat hosts.
03
Runbook step 3
Detection rules
- Network telemetry (Zeek/Suricata): Flag connections to 4000-4100/TCP from source IPs outside the cluster node list. Zeek shape: conn.log | id.resp_p >= 4000 and id.resp_p <= 4100 and not id.orig_h in cluster_nodes.
- Web access logs: Look for PUT requests with Content-Range, followed by GET requests with a crafted JSESSIONID cookie. SPL: index=web sourcetype=tomcat:access method=PUT | where isnotnull(content_range) | stats count by src_ip, uri.
- EDR process ancestry: Alert when java/java.exe (Tomcat) spawns sh, bash, cmd.exe, powershell.exe, curl or wget. KQL: DeviceProcessEvents | where InitiatingProcessFileName in~ ("java","java.exe") and FileName in~ ("cmd.exe","powershell.exe","sh","bash"). On Linux, use auditd execve events whose ppid is the Tomcat process.
- Filesystem (Sysmon EID 11 / auditd): Watch for new .session files or unexpected files under work/Catalina/*/ or webapps/ that don't match a deployment.
- Tomcat logs: In catalina.out, ClassNotFoundException, InvalidClassException or deserialisation errors during session load, and cluster receiver warnings about undecryptable messages, point to tampering attempts.

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: Actively exploited: treat the vulnerability as a priority in vulnerability handling under Art. 21(2)(e) NIS2. If it is exploited in your environment, check the reporting obligation under Art. 23 (early warning within 24 hours).
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: Since 11.09.2026, manufacturers of affected products with digital elements must report actively exploited vulnerabilities under Art. 14 CRA, with an early warning within 24 hours via ENISA's single reporting platform.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

Missing Encryption of Sensitive Data vulnerability in Apache Tomcat due to the fix for CVE-2026-29146 allowing the bypass of the EncryptInterceptor. This issue affects Apache Tomcat: 11.0.20, 10.1.53, 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.

Source: suse_csaf, OSV (Open Source Vulnerabilities), NVD (NIST), pwn.watch, cvelistv5, CISA KEV Catalog, redhat_csaf, ENISA EUVD, CVE.org (MITRE), CSA/SingCERT, BSI WID Portal, BSI CSAF

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Apache Software Foundation	Apache Tomcat	`10.1.53` `11.0.20` `9.0.116`	— — —
apache	tomcat	`9.0.116` `11.0.20` `10.1.53`	— — —
redhat	jboss_web_server	`7.0.0`	—

Vendors and products

Affected operating systems

Affected operating systems

Linux	redhat	enterprise_linux	`10.0`
Linux	redhat	enterprise_linux	`8.0`
Linux	redhat	enterprise_linux	`9.0`
Linux	redhat	enterprise_linux_els	`7.0`
Linux	redhat	enterprise_linux_eus	`10.0`
Linux	redhat	enterprise_linux_tus	`8.8`
Linux	redhat	enterprise_linux_update_services_for_sap_solutions	`8.8`
Linux	redhat	enterprise_linux_update_services_for_sap_solutions	`9.2`
Linux	redhat	enterprise_linux_update_services_for_sap_solutions	`9.4`
Linux	redhat	enterprise_linux_update_services_for_sap_solutions	`9.6`

Weakness classes (CWE)

CWE-311Missing Encryption of Sensitive Data
Class
The product does not encrypt sensitive or critical information before storage or transmission.
Entry at MITRE CWE-311
CWE-807Reliance on Untrusted Inputs in a Security Decision
Base
The product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism.
Entry at MITRE CWE-807

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

CISA KEV Catalog	CISA Known Exploited Vulnerability (opens in a new tab)cisa.gov	actively exploited	04.08.2026
CSA/SingCERT	Missing Encryption Vulnerability in Apache Tomcat (opens in a new tab)CSA/SingCERT	actively exploited	06.08.2026
PoC-in-GitHub (nomi-sec)	CVE-2026-34486---unauthenticated-RCE-via-Java-deserialization (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	19.08.2026
PoC-in-GitHub (nomi-sec)	cve-2026-34486-tomcat_encrypt_bypass_reproduction (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	23.07.2026

References & sources

lists.apache.orgApache Tomcat — CVE-2026-34486web, Vendor advisory, pwn-watch, Mailing list, Vendor advisory
NVD (NIST)NVD: CVE-2026-34486web, pwn-watch
vicarius.iovsociety/posts/cve-2026-34486-detection-script-rce-on-apache-to…web, Third-party advisory
vicarius.iovsociety/posts/cve-2026-34486-mitigation-script-rce-on-apache-t…web, Mitigation, Third-party advisory
access.redhat.comsecurity/cve/CVE-2026-34486web, Vulnerability database, x_refsource_REDHAT, Third-party advisory
bugzilla.redhat.comRHBZ#2457027web, Issue tracking, x_refsource_REDHAT, Issue tracking, Third-party advisory
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-34486.jsonweb, x_sadp-csaf-vex, Third-party advisory
access.redhat.comerrata/RHSA-2026:36787web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:36788web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:36789web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:36790web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:36876web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:36877web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:36878web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:36879web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:37136web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:37137web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:38505web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:39188web, Vendor advisory, x_refsource_REDHAT, Third-party advisory
access.redhat.comerrata/RHSA-2026:39189web, Vendor advisory, x_refsource_REDHAT, Third-party advisory

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

21.09.2026Record modifiedApache

New references:

https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly
Reference	removed	https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly	—
Reference type	removed	https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly Types: Mailing List, Vendor Advisory	—

Source identifier: security@apache.org

21.09.2026Record modifiedCISA ADP

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://socradar.io/blog/snowlight-government-chinese-campaign/
Reference	added	—	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34486
Reference	removed	https://socradar.io/blog/snowlight-government-chinese-campaign/	—
Reference	removed	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34486	—
Reference type	removed	https://socradar.io/blog/snowlight-government-chinese-campaign/ Types: Third Party Advisory	—
Reference type	removed	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34486 Types: US Government Resource	—

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

21.09.2026Record modifiedCVE Program

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://www.vicarius.io/vsociety/posts/cve-2026-34486-detection-script-rce-on-apache-tomcat
Reference	added	—	https://www.vicarius.io/vsociety/posts/cve-2026-34486-mitigation-script-rce-on-apache-tomcat
Reference	removed	https://www.vicarius.io/vsociety/posts/cve-2026-34486-detection-script-rce-on-apache-tomcat	—
Reference	removed	https://www.vicarius.io/vsociety/posts/cve-2026-34486-mitigation-script-rce-on-apache-tomcat	—
Reference type	removed	https://www.vicarius.io/vsociety/posts/cve-2026-34486-detection-script-rce-on-apache-tomcat Types: Third Party Advisory	—
Reference type	removed	https://www.vicarius.io/vsociety/posts/cve-2026-34486-mitigation-script-rce-on-apache-tomcat Types: Mitigation, Third Party Advisory	—

Source identifier: af854a3a-2127-422b-91ae-364da2661108

21.09.2026Record modifiedRed Hat ADP

New references:

and 8 more references

Show 48 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36787
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36788
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36789
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36790
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36876
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36877
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36878
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36879
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:37136
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:37137
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:38505
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:39188
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:39189
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-34486
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2457027
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34486.json
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36787	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36788	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36789	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36790	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36876	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36877	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36878	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36879	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:37136	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:37137	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:38505	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:39188	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:39189	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-34486	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2457027	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34486.json	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36787 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36788 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36789 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36790 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36876 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36877 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36878 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:36879 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:37136 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:37137 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:38505 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:39188 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/errata/RHSA-2026:39189 Types: Third Party Advisory	—
Reference type	removed	https://access.redhat.com/security/cve/CVE-2026-34486 Types: Third Party Advisory	—
Reference type	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2457027 Types: Issue Tracking, Third Party Advisory	—
Reference type	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34486.json Types: Third Party Advisory	—

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

10.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+18)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+18)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Show 9 older changes

06.08.2026Record modifiedCISA ADP
CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS V3.1: before AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, after —
Show 2 original changes
Individual changes of this event as published by NVD
Type Action Before After
CVSS added
—
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS removed
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
—
Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0
05.08.2026NVD analysis modifiedNVD

Individual changes of this event as published by NVD
Type	Action	Before	After
CVSS	added	—	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS	removed	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	—

05.08.2026Record modifiedCISA ADP

CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS V3.1: before AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, after —

CISA assessment (SSVC): exploitation: active, automatable: yes

Show 4 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
CVSS	added	—	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS	removed	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	—
SSVC assessment	changed	{"id":"CVE-2026-34486","role":"CISA Coordinator","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-04T00:00:00+00:00"}	{"id":"CVE-2026-34486","role":"CISA Coordinator","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-08-04T17:42:15.722474Z"}
SSVC assessment	changed	{"id":"CVE-2026-34486","role":"CISA Coordinator","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-04T00:00:00+00:00"}	{"id":"CVE-2026-34486","role":"CISA Coordinator","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-05T03:56:10.455827Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

05.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+18)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+18)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

04.08.2026NVD analysis modifiedNVD

Newly listed as affected:

Red Hat Redhat Enterprise Linux (8.0, 9.0, 10.0)
Red Hat Enterprise Linux (TUS) (8.8)
Red Hat Enterprise Linux Update Services For Sap Solutions (8.8, 9.2, 9.4, 9.6)
Red Hat Enterprise Linux Extended Update Support (EUS) (10.0)
Red Hat Enterprise Linux ELS (Extended Lifecycle Support) (7.0)
Red Hat JBOSS Web Server (7.0.0)

New references:

and 8 more references

Show 21 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Product configuration	added	—	OR cpe:2.3:o:redhat:enterprise_linux:8.0::::::: cpe:2.3:o:redhat:enterprise_linux:9.0::::::: cpe:2.3:o:redhat:enterprise_linux_tus:8.8::::::: cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:8.8::::::: cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.2::::::: cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.4::::::: cpe:2.3:o:redhat:enterprise_linux:10.0::::::: cpe:2.3:o:redhat:enterprise_linux_eus:10.0::::::: cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.6::::::: cpe:2.3:o:redhat:enterprise_linux_els:7.0::::::: cpe:2.3:a:redhat:jboss_web_server:7.0.0:::::::
Reference type	added	—	CISA-ADP: https://socradar.io/blog/snowlight-government-chinese-campaign/ Types: Third Party Advisory
Reference type	added	—	CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34486 Types: US Government Resource
Reference type	added	—	CVE: https://www.vicarius.io/vsociety/posts/cve-2026-34486-detection-script-rce-on-apache-tomcat Types: Third Party Advisory
Reference type	added	—	CVE: https://www.vicarius.io/vsociety/posts/cve-2026-34486-mitigation-script-rce-on-apache-tomcat Types: Mitigation, Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:36787 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:36788 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:36789 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:36790 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:36876 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:36877 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:36878 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:36879 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:37136 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:37137 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:38505 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:39188 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/errata/RHSA-2026:39189 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://access.redhat.com/security/cve/CVE-2026-34486 Types: Third Party Advisory
Reference type	added	—	redhat-SADP: https://bugzilla.redhat.com/show_bug.cgi?id=2457027 Types: Issue Tracking, Third Party Advisory
Reference type	added	—	redhat-SADP: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34486.json Types: Third Party Advisory

Source identifier: nvd@nist.gov

04.08.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: active, automatable: yes

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://socradar.io/blog/snowlight-government-chinese-campaign/
Reference	added	—	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34486
SSVC assessment	changed	{"id":"CVE-2026-34486","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-04-10T20:20:09.561886Z"}	{"id":"CVE-2026-34486","role":"CISA Coordinator","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-08-04T17:42:15.722474Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

20.07.2026Record modifiedRed Hat ADP

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:39188
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:39189
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+14)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+18)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

09.07.2026Record modifiedRed Hat ADP

New references:

and 6 more references

Show 11 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36787
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36788
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36789
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36790
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36876
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36877
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36878
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36879
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:37136
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:37137
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 (+4)	Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 8) (+12)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

06.07.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 (+4)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 (+4)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

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Linked advisories

CISA Adds Five CVEs to Known Exploited Vulnerabilities CatalogSANS NewsBites07.08.2026

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