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CVE-2026-40553

35
FAUCET Score

Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects 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:L/VA:L/SC:L/SI:L/SA:L/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
LOW
VS Availability
LOW
SS Confidentiality
LOW
SS Integrity
LOW
SS Availability
LOW
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.29%
Probability of exploitation in next 30 days
EPSS Percentile
21.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0029 is in the 5th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

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-2026-40553Moderate

Stack-based 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