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CVE-2026-27171

CVE-2026-27171

CVSS 2.9 LOWEPSS 0.2%CWE-1284
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.
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
zlib · zlib

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References
https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdfhttps://github.com/madler/zlib/issues/904https://github.com/madler/zlib/releases/tag/v1.3.2https://ostif.org/zlib-audit-complete/