CVE-2026-40467 — Use after free in gawk

Affected: GNU gawk

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.

USN-8588-1 — gawk vulnerabilities

Affected: Ubuntu:Pro:14.04:LTS: gawk, Ubuntu:Pro:16.04:LTS: gawk, Ubuntu:Pro:18.04:LTS: gawk, Ubuntu:Pro:20.04:LTS: gawk, Ubuntu:22.04:LTS: gawk, Ubuntu:24.04:LTS: gawk, Ubuntu:26.04:LTS: gawk

It was discovered that Gawk incorrectly handled memory when processing input using the getline redirection. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-40467)

It was discovered that Gawk incorrectly handled certain integer calculations when allocating memory. An attacker could possibly use this issue to cause a denial of service or overwrite heap memory with attacker-controlled data. (CVE-2026-40468)

It was discovered that Gawk incorrectly handled certain integer calculations when performing substitutions. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-40469)

It was discovered that Gawk incorrectly handled memory when reading directory entries. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-40553)

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CVE-2026-40467 — Use after free in gawk

USN-8588-1 — gawk vulnerabilities