# CVE-2026-22184

## Summary

- **CVE ID:** CVE-2026-22184
- **Severity:** MEDIUM
- **CVSS Score:** 8.6 (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)
- **CWE:** CWE-787
- **Published:** Jan 7, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- zlib software — zlib (0)

## References

- [CNA](https://seclists.org/fulldisclosure/2026/Jan/3)
- [CNA](https://zlib.net/)
- [CNA](https://github.com/madler/zlib)
- [CNA](https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname)
- [CVE](https://github.com/madler/zlib/issues/1142)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-22184)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2427688)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22184.json)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-470355.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.42%
- **EPSS Percentile:** 36.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._