CVE-2026-22184
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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3Description
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.
Analysis
Local privilege escalation in zlib 1.3.1.2 and earlier allows authenticated users to achieve arbitrary code execution through a buffer overflow in the contrib/untgz utility when processing command-line arguments with excessively long archive names. The vulnerability affects only the standalone untgz demonstration tool and does not impact the core zlib library. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.
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