HighCVE-2026-13732

Gdb: gdb: out-of-bounds write in stabs parser read_member_functions() via crafted elf (CVE-2026-13732)

Published 31.08.2026Last modified 04.11.2026Sources: Red Hat, BSI, SUSE, Msrc Update Guide, CVE.org

What is affected, what to do

Update Red Hat Enterprise Linux 10 to version 0:16.3-3.1.el10_2, Red Hat Enterprise Linux 8 to version 0:8.2-20.1.el8_10, Red Hat Enterprise Linux 9 to version 0:16.3-3.1.el9_8.

Affected: Red Hat Enterprise Linux 10 lt *..0:16.3-3.1.el10_2
Red Hat Enterprise Linux 8 lt *..0:8.2-20.1.el8_10
Red Hat Enterprise Linux 9 lt *..0:16.3-3.1.el9_8
Red Hat Cost Management On-Premise 1 lt *..1791460851
Red Hat Hardened Images lt *..17.2-6.2.hum1
Red Hat Update Infrastructure 5 lt *..1791978534
Red Hat Update Infrastructure 5 lt *..1791978528
Red Hat Update Infrastructure 5 lt *..1791964013
Red Hat Update Infrastructure 5 lt *..1791978693
Fixed in: Red Hat Enterprise Linux 10 0:16.3-3.1.el10_2
Red Hat Enterprise Linux 8 0:8.2-20.1.el8_10
Red Hat Enterprise Linux 9 0:16.3-3.1.el9_8
Red Hat Cost Management On-Premise 1 1791460851
Red Hat Hardened Images 17.2-6.2.hum1
Red Hat Update Infrastructure 5 1791978534
Red Hat Update Infrastructure 5 1791978528
Red Hat Update Infrastructure 5 1791964013
Red Hat Update Infrastructure 5 1791978693

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Metrics

7.0

Priority

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

Source: NVD, CVSS v3

7.0

CVSS v3

Severity High on the scale from 0 to 10.

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

0.1 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 2.8

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: 63.62 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: 7.0 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: 7.0
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: 0.1 %; 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: 2.8; Low — this CVE sits in the lower 10% of all CVEs scored today.
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: 31.08.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 1 September 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-787

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 GDB's STABS debug format parser. The read_member_functions() function in gdb/stabsread.c contains a linked list removal bug in the code that separates destructor and non-destructor member functions of C++ classes. The bug causes the destructor entries to remain in the main function list while the list length counter is decremented, resulting in an out-of-bounds write when the function list is copied to its final allocated array. An attacker can craft an ELF binary with malicious .stab and .stabstr sections that triggers this out-of-bounds write when a user opens the file in GDB and performs any symbol-inspection operation such as setting a breakpoint. The inferior process does not need to be executed. Under controlled conditions, this was demonstrated to achieve execution of arbitrary commands within the GDB process.

Source: redhat_csaf, BSI WID Portal, BSI CSAF, suse_csaf, Microsoft Security Update Guide, cvelistv5, NVD (NIST)

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
Red Hat	Red Hat Cost Management On-Premise 1	`< 1791460851`	`1791460851`
Red Hat	Red Hat Enterprise Linux 10	`< 0:16.3-3.1.el10_2`	`0:16.3-3.1.el10_2`
Red Hat	Red Hat Enterprise Linux 6	`—`	—
Red Hat	Red Hat Enterprise Linux 7	`—`	—
Red Hat	Red Hat Enterprise Linux 8	`< 0:8.2-20.1.el8_10`	`0:8.2-20.1.el8_10`
Red Hat	Red Hat Enterprise Linux 9	`< 0:16.3-3.1.el9_8`	`0:16.3-3.1.el9_8`
Red Hat	Red Hat Hardened Images	`< 17.2-6.2.hum1`	`17.2-6.2.hum1`
Red Hat	Red Hat Update Infrastructure 5	`< 1791978693` `< 1791978534` `< 1791978528` `< 1791964013`	`1791978693` `1791978534` `1791978528` `1791964013`

Vendors and products

Weakness classes (CWE)

CWE-787Out-of-bounds Write
Base
The product writes data past the end, or before the beginning, of the intended buffer.
Entry at MITRE CWE-787

References & sources

access.redhat.comsecurity/cve/CVE-2026-13732Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2494416Issue tracking, x_refsource_REDHAT
access.redhat.comRHSA-2026:73425Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:73427Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:73426Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:79357Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:82447Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:82939Vendor 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).

04.11.2026Record modifiedRed Hat

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/2026/13xxx/CVE-2026-13732.json">CVE-2026-13732</a>

Source identifier: secalert@redhat.com

14.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:82939

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/2026/13xxx/CVE-2026-13732.json">CVE-2026-13732</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:82939

Source identifier: secalert@redhat.com

14.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:82447

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/2026/13xxx/CVE-2026-13732.json">CVE-2026-13732</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:82447

Source identifier: secalert@redhat.com

09.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:79357

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/2026/13xxx/CVE-2026-13732.json">CVE-2026-13732</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:79357

Source identifier: secalert@redhat.com

29.09.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:73426

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/2026/13xxx/CVE-2026-13732.json">CVE-2026-13732</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:73426

Source identifier: secalert@redhat.com

Show 3 older changes

29.09.2026Record 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/2026/13xxx/CVE-2026-13732.json">CVE-2026-13732</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:73425
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:73427

Source identifier: secalert@redhat.com

01.09.2026Record 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	added	—	{"id":"CVE-2026-13732","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-09-01T14:33:22.469791Z"}

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

31.08.2026ReceivedRed Hat

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

Weakness type: CWE-787

Description added or changed

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Description	added	—	A flaw was found in GDB's STABS debug format parser. The read_member_functions() function in gdb/stabsread.c contains a linked list removal bug in the code that separates destructor and non-destructor member functions of C++ classes. The bug causes the destructor entries to remain in the main function list while the list length counter is decremented, resulting in an out-of-bounds write when the function list is copied to its final allocated array. An attacker can craft an ELF binary with malicious .stab and .stabstr sections that triggers this out-of-bounds write when a user opens the file in GDB and performs any symbol-inspection operation such as setting a breakpoint. The inferior process does not need to be executed. Under controlled conditions, this was demonstrated to achieve execution of arbitrary commands within the GDB process.
CVSS	added	—	AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness type (CWE)	added	—	CWE-787
Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/13xxx/CVE-2026-13732.json">CVE-2026-13732</a>
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-13732
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2494416

Source identifier: secalert@redhat.com

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