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CVE-2026-40469

40
FAUCET Score

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.

First published: Jul 13, 2026Last modified: Jul 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.4.0CPE matchmatch criteria
cpe:2.3:a:fossies:gawk:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

5.1MEDIUM

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.21%
Probability of exploitation in next 30 days
EPSS Percentile
11.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0021 is in the 0th percentile among its peer group of 36,821 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (7)

ubuntupatch availablevia ubuntu_usn
Product: gawk (bionic)Fixed in: 1:4.1.4+dfsg-1ubuntu0.1~esm2
ubuntupatch availablevia ubuntu_usn
Product: gawk (focal)Fixed in: 1:5.0.1+dfsg-1ubuntu0.1+esm1
ubuntupatch availablevia ubuntu_usn
Product: gawk (jammy)Fixed in: 1:5.1.0-1ubuntu0.2
ubuntupatch availablevia ubuntu_usn
Product: gawk (noble)Fixed in: 1:5.2.1-2ubuntu0.1
ubuntupatch availablevia ubuntu_usn
Product: gawk (resolute)Fixed in: 1:5.3.2-1ubuntu1.1
ubuntupatch availablevia ubuntu_usn
Product: gawk (trusty)Fixed in: 1:4.0.1+dfsg-2.1ubuntu2+esm2
ubuntupatch availablevia ubuntu_usn
Product: gawk (xenial)Fixed in: 1:4.1.3+dfsg-0.1ubuntu0.1~esm2

Vendor Advisories (2)

ubuntuUSN-8588-1

Gawk vulnerabilities

Jul 22, 2026
microsoft2026-Jul/CVE-2026-40469Moderate

Heap buffer overflow in gawk

Jul 14, 2026

References

cert.pl / en/posts/2026/07/CVE-2026-40467
Third Party Advisory
cgit.git.savannah.gnu.org / cgit/gawk.git/commit
Patch