Integer overflow in Fossies Gawk
CVE-2026-40468
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.
Vulnerability class: Integer Overflow
EPSS: 0.002 (9.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Fossies Gawk
- Gnu Gawk — versions 0
Weakness classification (CWE)
References
- cvd@cert.pl (Patch, patch)
- cvd@cert.pl (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-40468?
- CVE-2026-40468 is a critical-severity vulnerability in Fossies Gawk, classified under Integer Overflow or Wraparound. CVSS score: 9.1/10. Published 2026-07-13.
- How severe is CVE-2026-40468?
- Critical severity. CVSS v3 base score is 9.1 out of 10.