CVE-2026-40469
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)
CSIRTS triage
- What
- Gawk has vulnerabilities that could lead to denial of service or remote code execution due to improper memory handling and integer calculations.
- Who is affected
- Users of Gawk, particularly those on Ubuntu 26.04 LTS.
- Urgency
- Remediation is urgent as these vulnerabilities can be exploited to cause denial of service or execute arbitrary code.
- Action
- Update Gawk to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
Advisory coverage (3)
- unknownUSN-8588-1: Gawk vulnerabilitiesubuntu · 2026-07-22
- unknownCVE-2026-40469: Heap buffer overflow in gawkmsrc · 2026-07-14
- criticalCVE-2026-40469: Integer overflow vulnerability has been found in "builtin.c" program file of gawk (do_sub() ro…nvd · 2026-07-13
External references
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