Vulnerability Report

CVE-2026-22184

Title: Global Buffer Overflow in zlib untgz utility

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2026-22184.

CWE Category CWE-120

Published Date Jan 07, 2026

Modified Date Mar 18, 2026

Exploit Status Not Found

Score 4.6 CVSS v4.0

Exploit Probability (EPSS)

0.01%

Vulnerability Summary

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.

Impacted Vendors

zlib 1

cloudflare 1

Reference Links

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/

CVSS v4.0

Source Entity [email protected]

Severity MEDIUM

4.6

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

ACTIVE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

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

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.8

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns