CVE-2026-27171

PoC —

CVSS 3.1

5.5 medium

EPSS

<1%p12

Published

Feb 18, 2026 (Feb 18, 2026)

Modified

Jun 17, 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.

Vendors: zlib
Products: zlib
Weakness: CWE-1284
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.2%)

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