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CVE-2026-40469

Heap buffer overflow in gawk

Published: Jul 13, 2026Updated: Jul 14, 2026 Sources: CVE List NVDCWE-190
9.1CRITICAL
NVD MITRE
EPSS Score
0.2%
Top 88.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-190

Affected Products

GNU
oss-project·USaka g. nu
gawk
OSS Libraries
fossies
oss-projectaka catdoc
gawkLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
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References

https://cgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=ae1b2d508f46913269a9e62aceda3636afe8147b
cgit.git.savannah.gnu.org
https://cert.pl/en/posts/2026/07/CVE-2026-40467
cert.pl

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