| Name | CVE-2026-27171 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1128336 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| zlib (PTS) | bullseye (security), bullseye | 1:1.2.11.dfsg-2+deb11u2 | vulnerable |
| bookworm | 1:1.2.13.dfsg-1 | vulnerable |
| forky, trixie | 1:1.3.dfsg+really1.3.1-1 | vulnerable |
| sid | 1:1.3.dfsg+really1.3.1-3 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| zlib | source | (unstable) | (unfixed) | | | 1128336 |
Notes
[trixie] - zlib <no-dsa> (Minor issue)
[bookworm] - zlib <no-dsa> (Minor issue)
https://github.com/madler/zlib/issues/904
Fixed by: https://github.com/madler/zlib/commit/ba829a458576d1ff0f26fc7230c6de816d1f6a77 (v1.3.2)