CVE-2026-27171CWE-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…

Low · published February 18, 2026

CVSS v3.1
2.9
EPSS
0%
Percentile
10.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
2.9 · LOW
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00209 · 10.6th percentile
Weakness
CWE-1284 · Improper Validation of Specified Quantity in Input
Published
2026-02-18T02:36Z
EPSS history
Timeline
  • 18 FEB 02:36Z
    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…
    cvelistv5