Medium 4.6Published Jan 7, 2026

CVE-2026-22184zlib <= 1.3.1.2 untgz Global Buffer Overflow in TGZfname()

Updated under an hour ago (Oct 27, 2026, 1:23 PM ET)

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It affects zlib software zlib and 9 other products. Add what you run to find out whether that includes you.

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Every CVE for zlib software zlib

Exploited in the last 30 days

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: 4.6 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-787, CWE-120
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Modified
Record last updated: Sep 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

zlib software zlib zlib_software:zlib (from the name)	through 1.3.1.2	CNA record
Red Hat Logging Subsystem for Red Hat OpenShift redhat:logging	5	CISA ADP
Red Hat Red Hat build of OpenJDK 11 ELS redhat:openjdk_els	11	CISA ADP
Red Hat Red Hat build of OpenJDK 17 redhat:openjdk	17	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CISA ADP
Red Hat Red Hat JBoss Core Services redhat:jboss_core_services	1	CISA ADP
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CISA ADP
Red Hat Red Hat OpenStack Platform 16.2 redhat:openstack	16.2	CISA ADP
Siemens CADRA siemens:cadra (from the name)	all versions	CISA ADP
zlib zlib zlib:zlib	through 1.3.1.2	NVD

References

References

https://seclists.org/fulldisclosure/2026/Jan/3	technical-description, exploit, mailing-list, third-party-advisory
https://zlib.net/	product
https://github.com/madler/zlib	product
https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname	third-party-advisory
https://github.com/madler/zlib/issues/1142	issue-tracking
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.