What is CVE-2026-40467?

CVE-2026-40467 is a high-severity vulnerability in Fossies Gawk, classified under Use After Free. CVSS score: 7.5/10. Published 2026-07-13.

How severe is CVE-2026-40467?

High severity. CVSS v3 base score is 7.5 out of 10.

Use After Free in Fossies Gawk

CVE-2026-40467

Use After Free vulnerability has been found in "io.c" program file of gawk (do_getline_redir() routine). This issue may lead to a crash. It affects gawk in versions 5.4.0 and below.

Vulnerability class: Use-After-Free

Published 2026-07-13 · last modified 2026-07-14.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (10.7th percentile), scored 2026-10-13.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.7% 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)

CWE-416 — Use After Free

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-2026-40467?: CVE-2026-40467 is a high-severity vulnerability in Fossies Gawk, classified under Use After Free. CVSS score: 7.5/10. Published 2026-07-13.
How severe is CVE-2026-40467?: High severity. CVSS v3 base score is 7.5 out of 10.