CVE-2026-121994 (GCVE-0-2026-121994)

Vulnerability from cvelistv5 – Published: 2026-11-05 16:08 – Updated: 2026-11-06 04:56
VLAI
Title
Gdb: gdb: stack buffer overflow in fetch_register_using_p via unchecked p-reply length
Summary
A stack buffer overflow in the GDB client's remote protocol handler allows an attacker-controlled debug target to execute arbitrary code in the GDB process. The vulnerability exists in fetch_register_using_p, which decodes a stub's register reply into an alloca-sized buffer without bounding writes by the register width.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 00:00 UTC
CWE
  • CWE-121 - Stack-based Buffer Overflow
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1111 records in the last 180 days details
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-121994 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2565676 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-11-05 14:25
Credits
Red Hat would like to thank Pulkit Singh Singaria for reporting this issue.
Show details on NVD website
To clipboard 

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