CVE-2026-22184

zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname()

CVE-2026-22184 is fixed in 11 products on 1 platform, first by DEBIAN-CVE-2026-22184, released January 7, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

9.8

Critical

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0041

35th percentile

zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz. The vulnerability is limited to the standalone demonstration utility and does not affect the core zlib compression library. The flaw occurs when a user executes the untgz command with an excessively long archive name supplied via the command line, leading to an out-of-bounds write in a fixed-size global buffer.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
mingw-zlib · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
mingw32-zlib · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
mingw32-zlib-debuginfo · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
mingw32-zlib-static · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
mingw64-zlib · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
mingw64-zlib-debuginfo · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
mingw64-zlib-static · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
ucrt64-zlib · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
ucrt64-zlib-debuginfo · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
ucrt64-zlib-static · Fedora 43	1.3.2-1.fc43	FEDORA-2026-0AEE6AB474	Mar 1, 2026
zlib · Debian 12.15 (bookworm)	1:1.2.6.dfsg-1	DEBIAN-CVE-2026-22184	Jan 7, 2026
zlib · Debian 13.5 (trixie)	1:1.2.6.dfsg-1	DEBIAN-CVE-2026-22184	Jan 7, 2026
zlib · Debian 14	1:1.2.6.dfsg-1	DEBIAN-CVE-2026-22184	Jan 7, 2026

Details

Published
January 7, 2026
Weakness
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-22184

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