High 7.8Published Jan 7, 2026

CVE-2026-22184zlib versions up to and including 1.3.1.2 include a global buffer overflow in the untgz utility located under contrib/untgz.

Updated under an hour ago (2026-10-19 07:30 UTC)

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No exploitation reported and no EPSS estimate yet.

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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: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: Not given
NVD analysis: Modified
Record last updated: Sep 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

zlib zlib zlib:zlib	through 1.3.1.2	NVD

References

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