Low [CVE-2026-40469] Denial of Service due to integer overflow
This low-severity Red Hat Linux advisory covers CVE-2026-40469 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 6, Red Hat package: gawk.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
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. A flaw was found in gawk.
An integer overflow vulnerability exists in the `do_sub()` routine, which could allow an attacker to overwrite internal program data. This can lead to a denial of service (DoS) by causing the gawk program to crash.
Red Hat severity: Moderate — CVSS 2.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L). Weakness: CWE-190.
Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 6. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4 as not affected.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:40041, RHSA-2026:49661.
Affected products named by the advisory: Red Hat package: gawk.
Is CVE-2026-40469 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-40469 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-40469?
Upgrade to a fixed release named by Red Hat:
- gawk-main-5.4.0-3.1.hum1
- gawk-main-5.4.1-1.hum1
- RHSA-2026:40041
- RHSA-2026:49661
Confirm against the vendor advisory before you patch.
- 5.4.0
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- gawk-main-5.4.0-3.1.hum1
- gawk-main-5.4.1-1.hum1
- RHSA-2026:40041
- RHSA-2026:49661
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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