🛡️ CVE-2026-40467 — gawk

🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-416 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-40467 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2026-40467 is recorded against 1 package.

  • gawk (fixed in 5.4.0)

Timeline and source

Published on 13 July 2026 and last revised on 14 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

cert.pl
cgit.git.savannah.gnu.org

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-416
Public Exploit ✅ No
Source NVD
Published 2026-07-13
Updated 2026-08-11
Modified 2026-07-14

Affected Packages

Software From version Fixed in
gawk — 5.4.0

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