MediumCVE-2026-42015

Gnutls: gnutls: memory corruption due to off-by-one error in pkcs#12 bag handling (CVE-2026-42015)

Published 26.05.2026Last modified 14.10.2026Sources: BSI, Red Hat, Debian LTS, SUSE, Ubuntu, Debian, Msrc Update Guide, EUVD, CVE.org

What is affected, what to do

A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check.

Update Red Hat Enterprise Linux 10 to version 0:3.8.10-4.el10_2, Red Hat Enterprise Linux 10.0 Extended Update Support to version 0:3.8.9-9.el10_0.19, Red Hat Enterprise Linux 7 Extended Lifecycle Support to version 0:3.3.29-9.el7_9.2.

Affected: Gnutls eq 0..0
Red Hat Enterprise Linux 10 lt *..0:3.8.10-4.el10_2
Red Hat Enterprise Linux 10.0 Extended Update Support lt *..0:3.8.9-9.el10_0.19
Red Hat Enterprise Linux 7 Extended Lifecycle Support lt *..0:3.3.29-9.el7_9.2
Red Hat Enterprise Linux 8 lt *..0:3.6.16-8.el8_10.6
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support lt *..0:3.6.14-10.el8_4.1
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support lt *..0:4.13-3.el8_4.1
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On lt *..0:3.6.14-10.el8_4.1
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On lt *..0:4.13-3.el8_4.1
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support lt *..0:3.6.16-5.el8_6.5
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support lt *..0:4.13-3.el8_6.2
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On lt *..0:3.6.16-5.el8_6.5
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On lt *..0:4.13-3.el8_6.2
Red Hat Enterprise Linux 8.8 Telecommunications Update Service lt *..0:3.6.16-7.el8_8.4
Red Hat Enterprise Linux 8.8 Telecommunications Update Service lt *..0:4.13-4.el8_8.1
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions lt *..0:3.6.16-7.el8_8.4
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions lt *..0:4.13-4.el8_8.1
Red Hat Enterprise Linux 9 lt *..0:3.8.10-4.el9_8
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions lt *..0:3.7.6-21.el9_2.7
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions lt *..0:3.8.3-4.el9_4.6
Red Hat Enterprise Linux 9.6 Extended Update Support lt *..0:3.8.3-6.el9_6.4
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 lt *..1791371080
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 lt *..1791371069
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 lt *..1791788287
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 lt *..1791970484
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1791459707
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1791459711
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1791459759
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1789029076
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1791966259
Red Hat Cert Manager support for Red Hat OpenShift release 1.20 lt *..1790598593
Red Hat Discovery 2 lt *..1782159791
Red Hat Discovery 2 lt *..1782166952
Red Hat Hardened Images lt *..3.8.13-1.hum1
Red Hat OpenShift AI 3.4 lt *..1790703542
Red Hat Update Infrastructure 5 lt *..1781525684
Red Hat Update Infrastructure 5 lt *..1781525671
Red Hat Update Infrastructure 5 lt *..1781525693
Red Hat Update Infrastructure 5 lt *..1781525739
Red Hat Update Infrastructure 5 lt *..1787241211
Red Hat Update Infrastructure 5 lt *..1787135742
Red Hat Update Infrastructure 5 lt *..1787241260
Fixed in: Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2
Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19
Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:3.3.29-9.el7_9.2
Red Hat Enterprise Linux 8 0:3.6.16-8.el8_10.6
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:3.6.14-10.el8_4.1
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:4.13-3.el8_4.1
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:3.6.14-10.el8_4.1
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:4.13-3.el8_4.1
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:3.6.16-5.el8_6.5
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:4.13-3.el8_6.2
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:3.6.16-5.el8_6.5
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:4.13-3.el8_6.2
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:3.6.16-7.el8_8.4
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:4.13-4.el8_8.1
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:3.6.16-7.el8_8.4
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:4.13-4.el8_8.1
Red Hat Enterprise Linux 9 0:3.8.10-4.el9_8
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:3.7.6-21.el9_2.7
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:3.8.3-4.el9_4.6
Red Hat Enterprise Linux 9.6 Extended Update Support 0:3.8.3-6.el9_6.4
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371080
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371069
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791788287
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791970484
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791459707
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791459711
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791459759
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1789029076
Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791966259
Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790598593
Red Hat Discovery 2 1782159791
Red Hat Discovery 2 1782166952
Red Hat Hardened Images 3.8.13-1.hum1
Red Hat OpenShift AI 3.4 1790703542
Red Hat Update Infrastructure 5 1781525684
Red Hat Update Infrastructure 5 1781525671
Red Hat Update Infrastructure 5 1781525693
Red Hat Update Infrastructure 5 1781525739
Red Hat Update Infrastructure 5 1787241211
Red Hat Update Infrastructure 5 1787135742
Red Hat Update Infrastructure 5 1787241260

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Metrics

5.3

Priority

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

Source: NVD, CVSS v3

5.3

CVSS v3

Severity Medium on the scale from 0 to 10.

Source: BSI, Red Hat, Debian LTS, SUSE, Ubuntu, Debian, Msrc Update Guide, EUVD, CVE.org

0.7 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 54.0

Show all metrics

Severity: Medium
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: 67.82 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: 5.3 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: 5.3
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: 0.7 %; 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: 54.0; 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: 26.05.2026
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-193

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: Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
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 gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.

Source: BSI WID Portal, BSI CSAF, redhat_csaf, Debian LTS Advisories, suse_csaf, Ubuntu Security Notices, Debian Security Advisories, Microsoft Security Update Guide, ENISA EUVD, cvelistv5, NVD (NIST), 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
—	gnutls	`0`	—
Red Hat	Cert Manager support for Red Hat OpenShift release 1.17	`< 1791970484` `< 1791371080` `< 1791371069` `< 1791788287`	`1791970484` `1791371080` `1791371069` `1791788287`
Red Hat	Cert Manager support for Red Hat OpenShift release 1.18	`< 1791459711` `< 1791966259` `< 1791459707` `< 1789029076` `< 1791459759`	`1791459711` `1791966259` `1791459707` `1789029076` `1791459759`
Red Hat	Cert Manager support for Red Hat OpenShift release 1.20	`< 1790598593`	`1790598593`
Red Hat	Red Hat Discovery 2	`< 1782159791` `< 1782166952`	`1782159791` `1782166952`
Red Hat	Red Hat Enterprise Linux 10	`< 0:3.8.10-4.el10_2`	`0:3.8.10-4.el10_2`
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	`< 0:3.8.9-9.el10_0.19`	`0:3.8.9-9.el10_0.19`
Red Hat	Red Hat Enterprise Linux 6	`—`	—
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	`< 0:3.3.29-9.el7_9.2`	`0:3.3.29-9.el7_9.2`
Red Hat	Red Hat Enterprise Linux 8	`< 0:3.6.16-8.el8_10.6`	`0:3.6.16-8.el8_10.6`
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	`< 0:3.6.14-10.el8_4.1` `< 0:4.13-3.el8_4.1`	`0:3.6.14-10.el8_4.1` `0:4.13-3.el8_4.1`
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	`< 0:3.6.14-10.el8_4.1` `< 0:4.13-3.el8_4.1`	`0:3.6.14-10.el8_4.1` `0:4.13-3.el8_4.1`
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	`< 0:3.6.16-5.el8_6.5` `< 0:4.13-3.el8_6.2`	`0:3.6.16-5.el8_6.5` `0:4.13-3.el8_6.2`
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	`< 0:4.13-3.el8_6.2` `< 0:3.6.16-5.el8_6.5`	`0:4.13-3.el8_6.2` `0:3.6.16-5.el8_6.5`
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	`< 0:3.6.16-7.el8_8.4` `< 0:4.13-4.el8_8.1`	`0:3.6.16-7.el8_8.4` `0:4.13-4.el8_8.1`
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	`< 0:4.13-4.el8_8.1` `< 0:3.6.16-7.el8_8.4`	`0:4.13-4.el8_8.1` `0:3.6.16-7.el8_8.4`
Red Hat	Red Hat Enterprise Linux 9	`< 0:3.8.10-4.el9_8`	`0:3.8.10-4.el9_8`
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	`< 0:3.7.6-21.el9_2.7`	`0:3.7.6-21.el9_2.7`
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	`< 0:3.8.3-4.el9_4.6`	`0:3.8.3-4.el9_4.6`
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	`< 0:3.8.3-6.el9_6.4`	`0:3.8.3-6.el9_6.4`
Red Hat	Red Hat Hardened Images	`< 3.8.13-1.hum1`	`3.8.13-1.hum1`
Red Hat	Red Hat OpenShift AI 3.4	`< 1790703542`	`1790703542`
Red Hat	Red Hat OpenShift Container Platform 4	`—`	—
Red Hat	Red Hat Update Infrastructure 5	`< 1787241260` `< 1787135742` `< 1787241211` `< 1781525693` `< 1781525671` `< 1781525739` `< 1781525684`	`1787241260` `1787135742` `1787241211` `1781525693` `1781525671` `1781525739` `1781525684`
IBM	DataPower Gateway	`< 11.0.0.3` `< 10.6.0.11` `< 10.5.0.23`	`11.0.0.3` `10.6.0.11` `10.5.0.23`
IBM	QRadar SIEM	`<7.5.0 UP15 IF06`	—

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	gnutls28	`bookworm`
Linux	debian	gnutls28	`bullseye`
Linux	debian	gnutls28	`trixie`

Weakness classes (CWE)

CWE-193Off-by-one Error
Base
A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
Entry at MITRE CWE-193

References & sources

access.redhat.comRHSA-2026:20611euvd, Vendor advisory, x_refsource_REDHAT
access.redhat.comsecurity/cve/CVE-2026-42015euvd, Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2467678euvd, Issue tracking, x_refsource_REDHAT
access.redhat.comRHSA-2026:13274Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:20612Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:20613Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:26319Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:26409Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:29197Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:30004Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:30849Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:30850Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:32962Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:33125Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:41921Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:43575Vendor advisory, x_refsource_REDHAT
gnutls.orgsecurity-new.html
access.redhat.comRHSA-2026:58981Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:72502Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:74674Vendor 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).

14.10.2026Record modifiedRed Hat

New references:

Show 3 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/2026/42xxx/CVE-2026-42015.json">CVE-2026-42015</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:82857
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:82888