🛡️ CVE-2026-40469 — gawk

🔴 CVSS 9.1 — Critical ✅ No Known Exploit CWE-190 NVD
9.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Integer overflow vulnerability has been found in "builtin.c" program file of gawk (do_sub() routine). This issue could be used to overwrite gawk heap metadata and objects causing the program to crash. It affects 32-bit builds of 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 high, availability high.

Weakness class

CVE-2026-40469 is classified as CWE-190: Integer Overflow or Wraparound. Arithmetic produces a value too large for its type and wraps around, so a later size or bounds check passes when it should not.

Affected software

CVE-2026-40469 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 CRITICAL
CVSS Score 9.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CWE CWE-190
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

Exploit Protection

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CVE-2026-40469 carries CVSS 9.1 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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