Vulnerability · Published Jul 13, 2026 · Assigned by CERT-PL
CVE-2026-40469Heap buffer overflow in gawk
Medium 5.1
In plain English
A medium-severity integer overflow in gawk from GNU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.2%top 88.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | gawk | no fix listed | DEBIAN-CVE-2026-40469 |
| Debian:13 | gawk | no fix listed | DEBIAN-CVE-2026-40469 |
| Debian:14 | gawk | no fix listed | DEBIAN-CVE-2026-40469 |
| Ubuntu:22.04:LTS | gawk | 1:5.1.0-1ubuntu0.2 | USN-8588-1 |
| Ubuntu:22.04:LTS | gawk | 1:5.1.0-1ubuntu0.2 | UBUNTU-CVE-2026-40469 |
| Ubuntu:24.04:LTS | gawk | 1:5.2.1-2ubuntu0.1 | USN-8588-1 |
| Ubuntu:24.04:LTS | gawk | 1:5.2.1-2ubuntu0.1 | UBUNTU-CVE-2026-40469 |
| Ubuntu:26.04:LTS | gawk | 1:5.3.2-1ubuntu1.1 | UBUNTU-CVE-2026-40469 |
| Ubuntu:26.04:LTS | gawk | 1:5.3.2-1ubuntu1.1 | USN-8588-1 |
Affected products (as reported)
Weakness: CWE-190 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N