CVE-2026-22184

Name: CVE-2026-22184
Creator: NVD / NIST
Published: 2026-01-07T21:16:01.563+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.6/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2026-22184 is a medium-severity vulnerability rated 4.6/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

4.6/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.21%

11.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zlib	Zlib	<= 1.3.1.2

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

Timeline

Published: Jan 7, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-22184?

How severe is CVE-2026-22184?

CVE-2026-22184 has a CVSS score of 4.6/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2026-22184?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-22184?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST