CVE-2026-123151

Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail

Published Nov 5, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
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

Vendor Workaround

There is no mitigation for this vulnerability. Users should only connect GDB to trusted debug targets.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Red Hat
Red Hat enterprise Linux
Redhat hardened Images
Vendors & Products Red Hat
Red Hat enterprise Linux
Redhat hardened Images
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Description 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.
Title Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat rhel Els
Weaknesses CWE-121
CPEs cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat rhel Els
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 6, 2026, 8:16 AM
Reserved
Nov 5, 2026, 3:35 PM
Status
Awaiting Analysis
Published
Nov 5, 2026, 5:18 PM
Modified
Nov 5, 2026, 10:17 PM
Severity
Important
Public date
Nov 5, 2026, 2:58 PM