CVE-2026-40468: 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. This issue may lead to memory exhaustion on the hosting operating system and could be used to overwrite gawk heap metadata and objects with attacker-controlled bytes. It affects 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.