CVE-2026-40469: CWE-190 Integer Overflow or Wraparound in GNU gawk
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.
AI Analysis
Technical Summary
CVE-2026-40469 is an integer overflow vulnerability in the do_sub() routine of the builtin.c source file in GNU gawk. It affects 32-bit builds of gawk versions prior to 5.4.1. The overflow can overwrite heap metadata and objects, leading to program crashes. The vulnerability has a CVSS 4.0 base score of 5.1, indicating medium severity. No vendor advisory or patch information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation of this vulnerability may cause gawk to crash due to corrupted heap metadata and objects. There is no indication from the data that this leads to code execution or privilege escalation. The impact is limited to denial of service through application crash.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider avoiding use of vulnerable 32-bit gawk versions or running gawk in environments where crashes can be tolerated. Monitor for vendor updates regarding patches.
CVE-2026-40469: CWE-190 Integer Overflow or Wraparound in GNU gawk
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.
CVSS v4.0
Score 5.1medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-40469 is an integer overflow vulnerability in the do_sub() routine of the builtin.c source file in GNU gawk. It affects 32-bit builds of gawk versions prior to 5.4.1. The overflow can overwrite heap metadata and objects, leading to program crashes. The vulnerability has a CVSS 4.0 base score of 5.1, indicating medium severity. No vendor advisory or patch information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation of this vulnerability may cause gawk to crash due to corrupted heap metadata and objects. There is no indication from the data that this leads to code execution or privilege escalation. The impact is limited to denial of service through application crash.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider avoiding use of vulnerable 32-bit gawk versions or running gawk in environments where crashes can be tolerated. Monitor for vendor updates regarding patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERT-PL
- Date Reserved
- 2026-04-13T14:44:55.647Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a54e21068715ace4303d417
Added to database: 07/13/2026, 13:03:12 UTC
Last enriched: 07/13/2026, 13:17:45 UTC
Last updated: 07/13/2026, 13:48:27 UTC
Views: 4
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