CVE-2026-40469

Heap buffer overflow in gawk

State: Published
Severity: 5.1 Medium
Published: Jul 13, 2026
Updated: Jul 13, 2026
Reserved: Apr 13, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	CERT-PL

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
gawkGNU	5.4.0 and earlierAffected

References

https://cgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=ae1b2d508f46913269a9e62aceda3636afe8147bpatch
https://cert.pl/en/posts/2026/07/CVE-2026-40467third-party-advisory

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