Vulnerability in GNU gawk

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund29 Sep 2026WID-SEC-2026-3649

  Red Hat Enterprise Linux (gawk): Multiple vulnerabilities Translated from German

  CVE-2026-40467CVE-2026-40468CVE-2026-40553

[ References ]References

• cgit.git.savannah.gnu.org/cgit/gawk.git/commitpatch
• cert.pl/en/posts/2026/07/CVE-2026-40467third-party-advisory