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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (9.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Fossies Gawk
- GNU Gawk — versions 0
Weakness classification (CWE)
References
- cgit.git.savannah.gnu.org/cgit/gawk.git/commit/ (Patch, patch)
- cert.pl/en/posts/2026/07/CVE-2026-40467 (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.