HighCVE-2026-9697

undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent (CVE-2026-9697)

Published 17.06.2026Last modified 10.09.2026Sources: Red Hat, BSI, Msrc Update Guide, OSV, CVE.org, Hersteller

What is affected, what to do

Update Undici to version 7.28.0, Undici to version 8.5.0.

Affected: Undici lt 7.23.0..7.28.0
Undici lt 8.0.0..8.5.0
Fixed in: Undici 7.28.0
Undici 8.5.0

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

Metrics

7.4

Priority

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

Source: NVD, CVSS v3

7.4

CVSS v3

Severity High on the scale from 0 to 10.

Source: Red Hat, BSI, Msrc Update Guide, OSV, CVE.org, Hersteller

0.5 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 39.7

Show all metrics

Severity: High
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: 68.68 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: no public PoC known
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: 7.4 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: 7.4
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: 0.5 %; Low — model estimates < 1% exploitation likelihood.
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: 39.7; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
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: —
Published: 17.06.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 22 June 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-295

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: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
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: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
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

A flaw was found in undici. When undici's ProxyAgent is configured with a SOCKS5 proxy Uniform Resource Identifier (URI), it silently ignores Transport Layer Security (TLS) options, such as custom Certificate Authorities (CAs). This allows a remote attacker to perform a Man-in-the-Middle (MITM) attack, intercepting and tampering with HTTPS communications. The connection falls back to Node.js's default trust store, bypassing intended security configurations and potentially leading to information disclosure or arbitrary code execution.

Source: redhat_csaf, BSI WID Portal, BSI CSAF, Microsoft Security Update Guide, OSV (Open Source Vulnerabilities), cvelistv5, NVD (NIST), GitHub Security Advisories, CVE.org (MITRE)

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
undici	undici	`7.23.0 – < 7.28.0` `8.0.0 – < 8.5.0`	`7.28.0` `8.5.0`
nodejs	undici	`8.0.0 – < 8.5.0` `7.23.0 – < 7.28.0`	`8.5.0` `7.28.0`
IBM	App Connect Enterprise	`< 12.0.12.28` `< 13.0.8.1`	`12.0.12.28` `13.0.8.1`
IBM	App Connect Enterprise CD	`< 13.4.0`	`13.4.0`
IBM	App Connect Enterprise LTS	`< 13.4.0` `< 12.0.26`	`13.4.0` `12.0.26`
npm	undici	`8.0.0` `7.23.0`	— —

Vendors and products

Weakness classes (CWE)

CWE-295Improper Certificate Validation
Base
The product does not validate, or incorrectly validates, a certificate.
Entry at MITRE CWE-295

References & sources

github.comnodejs/undici/security/advisories/GHSA-vmh5-mc38-953gweb
NVD (NIST)vuln/detail/CVE-2026-9697advisory
cna.openjsf.orgsecurity-advisories.htmlweb
github.comnodejs/undicipackage
access.redhat.comsecurity/cve/CVE-2026-9697Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2490018Issue tracking, x_refsource_REDHAT
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-9697.jsonx_sadp-csaf-vex
access.redhat.comerrata/RHSA-2026:48151Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35841Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:39868Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35891Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:34342Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:36754Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:41929Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:38236Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:7378Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:22380Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:22934Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:36621Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:47728Vendor advisory, x_refsource_REDHAT

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).

10.09.2026Record 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)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/9xxx/CVE-2026-9697.json">CVE-2026-9697</a>

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

09.09.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:65126

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/9xxx/CVE-2026-9697.json">CVE-2026-9697</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:65126

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

31.08.2026Record 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)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/9xxx/CVE-2026-9697.json">CVE-2026-9697</a>

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

28.08.2026Record modifiedOpenJS Foundation

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://cna.openjsf.org/security-advisories.html
Reference	added	—	https://github.com/nodejs/undici/security/advisories/GHSA-vmh5-mc38-953g
Reference	removed	https://cna.openjsf.org/security-advisories.html	—
Reference	removed	https://github.com/nodejs/undici/security/advisories/GHSA-vmh5-mc38-953g	—
Reference type	removed	https://cna.openjsf.org/security-advisories.html Types: Vendor Advisory	—
Reference type	removed	https://github.com/nodejs/undici/security/advisories/GHSA-vmh5-mc38-953g Types: Mitigation, Vendor Advisory	—

Source identifier: ce714d77-add3-4f53-aff5-83d477b104bb

28.08.2026Record modifiedRed Hat ADP

New references:

and 8 more references

Show 44 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/9xxx/CVE-2026-9697.json">CVE-2026-9697</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:22380
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:22934
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34342
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35841
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35891
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36621
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36754
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36820
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:38236
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:39868
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:41929
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:47728
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:48124
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:48151
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:56366
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:56431
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:57013
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:60520
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:7378
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-9697
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2490018
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9697.json
Reference	removed	https://access.redhat.com/errata/RHSA-2026:22380	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:22934	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34342	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:35841	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:35891	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36621	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36754	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36820	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:38236	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:39868	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:41929	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:47728	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:48124	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:48151	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:56366	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:56431	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:57013	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:7378	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-9697	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2490018	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9697.json	—

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

Show 11 older changes

24.08.2026Record 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	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+106)	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+106)

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

20.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:57013

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:57013
Affected versions (publisher)	changed	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+84)	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+106)

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

19.08.2026Record 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-2026:56366
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:56431
Affected versions (publisher)	changed	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+48)	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+84)

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

06.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:47728

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:47728
Affected versions (publisher)	changed	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+47)	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+48)

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

30.07.2026Record 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-2026:48124
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:48151
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 (+47)	Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+47)

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

21.07.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:41929

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:41929
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 (+46)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 (+47)

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

09.07.2026Record 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-2026:36754
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36820
Affected versions (publisher)	changed	Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9), Cluster Observability Operator 1.5.0 (+14)	Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9), Cluster Observability Operator 1.5.0 (+15)

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

06.07.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:35841

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35841
Affected versions (publisher)	changed	Cluster Observability Operator 1.5.0, Red Hat Hardened Images, Cryostat 4 (+12)	Red Hat Enterprise Linux AppStream (v. 10), Cluster Observability Operator 1.5.0, Red Hat Hardened Images (+13)

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

25.06.2026Initial analysis by NVDNVD

Newly listed as affected:

Nodejs undici (7.23.0 – before 7.28.0; 8.0.0 – before 8.5.0)

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Product configuration	added	—	OR cpe:2.3:a:nodejs:undici::::::node.js:: versions from (including) 7.23.0 up to (excluding) 7.28.0 cpe:2.3:a:nodejs:undici::::::node.js:: versions from (including) 8.0.0 up to (excluding) 8.5.0
Reference type	added	—	openjs: https://cna.openjsf.org/security-advisories.html Types: Vendor Advisory
Reference type	added	—	openjs: https://github.com/nodejs/undici/security/advisories/GHSA-vmh5-mc38-953g Types: Mitigation, Vendor Advisory

Source identifier: nvd@nist.gov

23.06.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: no

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	changed	{"id":"CVE-2026-9697","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-06-17T18:34:18.472294Z"}	{"id":"CVE-2026-9697","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-06-22T00:00:00+00:00"}

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

17.06.2026ReceivedOpenJS Foundation

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

Weakness type: CWE-295

Description added or changed

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	undici
Description	added	—	Impact: undici's ProxyAgent silently drops the requestTls option when configured with a SOCKS5 proxy URI (socks5:// or socks://). The target HTTPS connection through the SOCKS5 tunnel falls back to Node's default trust store, ignoring user-configured ca, cert, key, rejectUnauthorized, and servername settings. Applications that pin to an internal or corporate CA via requestTls.ca will, when their proxy URI is SOCKS5, get the default Mozilla CA bundle as the trust anchor instead. Any cert signed by any publicly-trusted CA for the target hostname is accepted, breaking the intended pin and enabling MITM read and tamper of the HTTPS exchange. Affected applications are those that use undici's ProxyAgent (or Socks5ProxyAgent directly) with SOCKS5 AND rely on requestTls for TLS scope restriction. The bug was introduced in undici 7.23.0 when SOCKS5 support was added. Patches: Upgrade to undici v7.28.0 or v8.5.0. Workarounds: No workaround is available within the SOCKS5 path. If a SOCKS5 proxy with TLS scope restriction is required and an upgrade is not yet possible, route the traffic through an HTTP-proxy ProxyAgent instead, where requestTls is honored correctly.
CVSS	added	—	AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness type (CWE)	added	—	CWE-295
Reference	added	—	https://cna.openjsf.org/security-advisories.html
Reference	added	—	https://github.com/nodejs/undici/security/advisories/GHSA-vmh5-mc38-953g

Source identifier: ce714d77-add3-4f53-aff5-83d477b104bb

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<a href="https://intel.neosec.eu/en/cve/CVE-2026-9697"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-9697.svg?lang=en" alt="CVE-2026-9697 – NEOSEC Intel" height="20"></a>