CVE-2026-22184
zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname()
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | zlib software |
| Product | zlib |
| Published | Jan 7, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
zlib software / zlib
0 ≤ 1.3.1.2
References
seclists.org: https://seclists.org/fulldisclosure/2026/Jan/3 zlib.net: https://zlib.net/ github.com: https://github.com/madler/zlib vulncheck.com: https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname github.com: https://github.com/madler/zlib/issues/1142 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-22184 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2427688 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.json cert-portal.siemens.com: https://cert-portal.siemens.com/productcert/html/ssa-470355.html
Credits
Ron Edgerson