CVE-2026-22184
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.
- Score
- CVSS 3.1 8.6 High
- Status
- Modified - disclosure@vulncheck.com
- Published
- 2026-01-07
- Last modified
- 2026-09-01
- Weaknesses
- CWE-120, CWE-787
Affected products
- Enterprise Linux (Redhat)
- Jboss Core Services (Redhat)
- Logging (Redhat)
- Openjdk (Redhat)
- Openjdk Els (Redhat)
- Openshift (Redhat)
- Openstack (Redhat)
- Cadra (Siemens)
- Zlib (Zlib)
References
- https://github.com/madler/zlib
- https://seclists.org/fulldisclosure/2026/Jan/3
- https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname
- https://zlib.net/
- https://github.com/madler/zlib/issues/1142
- https://access.redhat.com/security/cve/CVE-2026-22184
- https://bugzilla.redhat.com/show_bug.cgi?id=2427688
- https://cert-portal.siemens.com/productcert/html/ssa-470355.html
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.json
