CVE-2026-40469: Fossies Gawk

Critical severity, CVSS 9.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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 products

• Fossies Gawk: up to and including 5.4.0

Published 2026-07-13. Last modified 2026-07-14.