Name: CVE-2026-22184: Out-of-bounds Write
Creator: Rapid7
Published: 2026-01-07T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-22184, CWE-120, CWE-787, CVSS 7.8, EPSS 0.0035

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.

CVSS Details

CVSS 4.0 Base Score: 4.6 (MEDIUM)
CVSS 4.0 Vector: (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/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)
CVSS 3.1 Base Score: 7.8
CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alpine Linux	—	Upgrade zlib	Mar 9, 2026	Jan 7, 2026
Debian	—	Upgrade zlib	Jan 9, 2026	Jan 9, 2026
Redhat_linux	—	No solution exists	Jul 17, 2026	Jan 7, 2026

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CVSS Details

Covered by Rapid7

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