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Fencer Vulns
high 7.5

CVE-2026-123151 json

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

published 2026-11-05 3 d ago modified 2026-11-06 3 d ago also EUVD-2026-117575

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-123151 updated

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

  • Red Hat Enterprise Linux 6 gdb, gdb-gdbserver, gdb 14.2-4.1.el10_0 Red Hat Enterprise Linux 7 gdb-gdbserver, gdb 14.2-4.1.el10_0 Red Hat Enterprise Linux 8 gdb, gdb-headless, gdb-gdbserver, gdb 14.2-4.1.el10_0 Red Hat Enterprise Linux 9 gdb, gdb-minimal, gdb-headless, gdb-gdbserver, gdb 14.2-4.1.el10_0 Red Hat Enterprise Linux 10 gdb 14.2-4.1.el10_0 Red Hat Hardened Images gdb 14.2-4.1.el10_0
    affected: workaround, no fix available “There is no mitigation for this vulnerability. Users should only connect GDB to trusted debug targets.”
  • Red Hat Enterprise Linux 8 crash 9.0.2-1.el10, gcc-toolset-14-gdb 14.2-3.el8_10, gcc-toolset-15-gdb 16.3-1.el8_10 Red Hat Enterprise Linux 9 crash 9.0.2-1.el10 Red Hat Enterprise Linux 10 crash 9.0.2-1.el10
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 d ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Hardened Images

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.