CVE-2026-40467

EUVD-2026-43492
Use After Free vulnerability has been found in "io.c" program file of gawk (do_getline_redir() routine). This issue may lead to a crash. It affects gawk in versions 5.4.0 and below.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 11.48%
Affected Products (NVD)
VendorProductVersion
fossiesgawk
𝑥
≤ 5.4.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
gawk
bookworm
vulnerable
bullseye
vulnerable
forky
vulnerable
sid
vulnerable
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
gawk
bionic
Fixed 1:4.1.4+dfsg-1ubuntu0.1~esm2
released
focal
Fixed 1:5.0.1+dfsg-1ubuntu0.1+esm1
released
jammy
Fixed 1:5.1.0-1ubuntu0.2
released
noble
Fixed 1:5.2.1-2ubuntu0.1
released
resolute
Fixed 1:5.3.2-1ubuntu1.1
released
trusty
Fixed 1:4.0.1+dfsg-2.1ubuntu2+esm2
released
xenial
Fixed 1:4.1.3+dfsg-0.1ubuntu0.1~esm2
released
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
gawk
Amazon Linux 2023
0:5.1.0-3.amzn2023.0.4
fixed
gawk-all-langpacks
Amazon Linux 2023
0:5.1.0-3.amzn2023.0.4
fixed
gawk-debuginfo
Amazon Linux 2023
0:5.1.0-3.amzn2023.0.4
fixed
gawk-debugsource
Amazon Linux 2023
0:5.1.0-3.amzn2023.0.4
fixed
gawk-devel
Amazon Linux 2023
0:5.1.0-3.amzn2023.0.4
fixed
gawk-doc
Amazon Linux 2023
0:5.1.0-3.amzn2023.0.4
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
gawk
Azure Linux 3.0
0:5.2.2-2.azl3
fixed
Common Weakness Enumeration
References
https://cert.pl/en/posts/2026/07/CVE-2026-40467
https://cgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=a2d18c74109e41bec29a23098eba2e00057286d8