# CVE-2026-123151: Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail

Status: published. Published: 2026-11-05. Updated: 2026-11-06.

A flaw was found in the GNU debugger (GDB). When GDB connects to a remote debug target, a malicious target can cause GDB to overflow a buffer on the stack while parsing the target's replies. This can crash GDB or potentially allow the target to execute arbitrary code in the GDB client process with the privileges of the user running GDB.

## Remediation

- workaround: There is no mitigation for this vulnerability. Users should only connect GDB to trusted debug targets. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (crash): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (gdb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gdb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gdb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (crash): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gcc-toolset-14-gdb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gcc-toolset-15-gdb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gdb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (crash): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gdb): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Hardened Images (gdb): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: ADP: CISA-ADP

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-121

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-123151 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2567333 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-123151 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2567333 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-123151; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123151; retrieved 2026-11-06; source updated 2026-11-05

Revision: 4187a59b55f50c542e54064a6b680d8514249ae792cfe713d97df7d2acf4337b

Canonical: https://y2.dev/cve/CVE-2026-123151

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