CVE-2026-27171
Published: February 21, 2026Last modified: February 26, 2026
Description
zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | zlib | Fixed (1.2.13-r1) |
| 25 LTS | zlib | Fixed (1.3.2-r0) | |
| Stream | zlib | Fixed (1.3.2-r0) | |
| Hardened Containers | 23 LTS | zlib | Fixed (1.2.13-r1) |
| 25 LTS | zlib | Fixed (1.3.2-r0) | |
| Stream | zlib | Fixed (1.3.2-r0) |