CVE-2026-22184
Published: January 9, 2026Last modified: January 19, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Notes
the issue is with `untgz` utility in `contrib`. We do not build it.
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | zlib | Not affected (1.2.13-r0) |
| 25 LTS | zlib | Not affected (1.3.1-r2) | |
| Stream | zlib | Not affected (1.2.13-r0) | |
| Hardened Containers | 23 LTS | zlib | Not affected (1.2.13-r0) |
| 25 LTS | zlib | Not affected (1.3.1-r2) | |
| Stream | zlib | Not affected (1.2.13-r0) |