by Kastro
Paper/Archive/CVE-2026-40469

CVE-2026-40469

GNU gawk — Heap buffer overflow in gawk

EPSS 0.2%CVSS 9.1
critical.is priorityof 100
30
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 11.7.117 × 202.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Integer overflow vulnerability has been found in "builtin.c" program file of gawk (do_sub() routine). This issue could be used to overwrite gawk heap metadata and objects causing the program to crash. It affects 32-bit builds of gawk in versions 5.4.0 and below.

Affected

ProductAffectedFixed inSource
gawk≤ 5.4.0–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CERT-PL (CNA)5.1CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

patchcgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=ae1b2d508f46913269a9e62aceda3636afe8147bwriteupcert.pl/en/posts/2026/07/CVE-2026-40467