CVE-2026-22184

Description

zlib versions up to and including 1.3.1.2 contain a global buffer overflow in the untgz utility. The TGZfname() function copies an attacker-supplied archive name from argv[] into a fixed-size 1024-byte static global buffer using an unbounded strcpy() call without length validation. Supplying an archive name longer than 1024 bytes results in an out-of-bounds write that can lead to memory corruption, denial of service, and potentially code execution depending on compiler, build flags, architecture, and memory layout. The overflow occurs prior to any archive parsing or validation.

References

https://zlib.net/

https://www.vulncheck.com/advisories/zlib-untgz-global-buffer-overflow-in-tgzfname

https://seclists.org/fulldisclosure/2026/Jan/3

https://github.com/madler/zlib/issues/1142

https://github.com/madler/zlib

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS