CVE-2026-27171
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.
CVE-2026-27171 is fixed in 37 products on 1 platform, first by lib32z1 1:1.3.dfsg-3.1ubuntu2.2, released February 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
5.5
Low
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0025
16th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| lib32z1 · Ubuntu 24.04.5 LTS (noble) | 1:1.3.dfsg-3.1ubuntu2.2 | lib32z1 1:1.3.dfsg-3.1ubuntu2.2 | Feb 17, 2026 |
| lib32z1 · Ubuntu 26.04.1 LTS (resolute) | 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | lib32z1 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | Feb 17, 2026 |
| lib64z1 · Ubuntu 24.04.5 LTS (noble) | 1:1.3.dfsg-3.1ubuntu2.2 | lib64z1 1:1.3.dfsg-3.1ubuntu2.2 | Feb 17, 2026 |
| lib64z1 · Ubuntu 26.04.1 LTS (resolute) | 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | lib64z1 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | Feb 17, 2026 |
| libminizip1t64 · Ubuntu 24.04.5 LTS (noble) | 1:1.3.dfsg-3.1ubuntu2.2 | libminizip1t64 1:1.3.dfsg-3.1ubuntu2.2 | Feb 17, 2026 |
| libminizip1t64 · Ubuntu 26.04.1 LTS (resolute) | 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | libminizip1t64 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | Feb 17, 2026 |
| libx32z1 · Ubuntu 24.04.5 LTS (noble) | 1:1.3.dfsg-3.1ubuntu2.2 | libx32z1 1:1.3.dfsg-3.1ubuntu2.2 | Feb 17, 2026 |
| libx32z1 · Ubuntu 26.04.1 LTS (resolute) | 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | libx32z1 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | Feb 17, 2026 |
| minizip · Ubuntu 24.04.5 LTS (noble) | 1:1.3.dfsg-3.1ubuntu2.2 | minizip 1:1.3.dfsg-3.1ubuntu2.2 | Feb 17, 2026 |
| minizip · Ubuntu 26.04.1 LTS (resolute) | 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | minizip 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | Feb 17, 2026 |
| nodejs20 · amzn 2023 | 1:20.20.2-1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs20-debuginfo · amzn 2023 | 1:20.20.2-1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs20-debugsource · amzn 2023 | 1:20.20.2-1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs20-devel · amzn 2023 | 1:20.20.2-1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs20-docs · amzn 2023 | 1:20.20.2-1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs20-full-i18n · amzn 2023 | 1:20.20.2-1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs20-libs · amzn 2023 | 1:20.20.2-1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs20-libs-debuginfo · amzn 2023 | 1:20.20.2-1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs20-npm · amzn 2023 | 1:10.8.2-1.20.20.2.1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| nodejs22 · amzn 2023 | 1:22.22.2-1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs22-debuginfo · amzn 2023 | 1:22.22.2-1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs22-debugsource · amzn 2023 | 1:22.22.2-1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs22-devel · amzn 2023 | 1:22.22.2-1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs22-docs · amzn 2023 | 1:22.22.2-1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs22-full-i18n · amzn 2023 | 1:22.22.2-1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs22-libs · amzn 2023 | 1:22.22.2-1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs22-libs-debuginfo · amzn 2023 | 1:22.22.2-1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs22-npm · amzn 2023 | 1:10.9.7-1.22.22.2.1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| nodejs24 · amzn 2023 | 1:24.15.0-1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| nodejs24-debuginfo · amzn 2023 | 1:24.15.0-1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| nodejs24-debugsource · amzn 2023 | 1:24.15.0-1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| nodejs24-devel · amzn 2023 | 1:24.15.0-1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| nodejs24-docs · amzn 2023 | 1:24.15.0-1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| nodejs24-full-i18n · amzn 2023 | 1:24.15.0-1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| nodejs24-libs · amzn 2023 | 1:24.15.0-1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| nodejs24-libs-debuginfo · amzn 2023 | 1:24.15.0-1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| nodejs24-npm · amzn 2023 | 1:11.12.1-1.24.15.0.1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| v8-11.3-devel · amzn 2023 | 3:11.3.244.8-1.20.20.2.1.amzn2023.0.2 | ALAS2023-2026-1608 | Apr 27, 2026 |
| v8-12.4-devel · amzn 2023 | 3:12.4.254.21-1.22.22.2.1.amzn2023.0.2 | ALAS2023-2026-1616 | Apr 27, 2026 |
| v8-13.6-devel · amzn 2023 | 3:13.6.233.17-1.24.15.0.1.amzn2023.0.1 | ALAS2023-2026-1609 | Apr 27, 2026 |
| zlib · Debian 13.5 (trixie) | 1:1.3.dfsg+really1.3.1-1+deb13u1 | DEBIAN-CVE-2026-27171 | Feb 18, 2026 |
| zlib · Debian 14 | 1:1.3.dfsg+really1.3.2-1 | DEBIAN-CVE-2026-27171 | Feb 18, 2026 |
| zlib · opensuse-leap 15.6 | 1.2.13-150500.4.6.1 | SUSE-SU-2026:0783-1 | Mar 3, 2026 |
| zlib · opensuse-leap 16.0 | 1.2.13-160000.3.1 | OPENSUSE-SU-2026:20487-1 | Apr 9, 2026 |
| zlib · sles 15.7 | 1.2.13-150500.4.6.1 | SUSE-SU-2026:0783-1 | Mar 3, 2026 |
| zlib · sles 16.0 | 1.2.13-160000.3.1 | SUSE-SU-2026:21151-1 | Apr 9, 2026 |
| zlib1g · Ubuntu 24.04.5 LTS (noble) | 1:1.3.dfsg-3.1ubuntu2.2 | zlib1g 1:1.3.dfsg-3.1ubuntu2.2 | Feb 17, 2026 |
| zlib1g · Ubuntu 26.04.1 LTS (resolute) | 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | zlib1g 1:1.3.dfsg+really1.3.1-1ubuntu3.1 | Feb 17, 2026 |
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