Improper Validation of Specified Quantity in Input Affecting zlib package, versions <1:1.3.dfsg+really1.3.1-1ubuntu3.1


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.23% (14th percentile)

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  • Snyk IDSNYK-UBUNTU2604-ZLIB-16235638
  • published25 Jun 2026
  • disclosed18 Feb 2026

Introduced: 18 Feb 2026

CVE-2026-27171  (opens in a new tab)
CWE-1284  (opens in a new tab)

How to fix?

Upgrade Ubuntu:26.04 zlib to version 1:1.3.dfsg+really1.3.1-1ubuntu3.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream zlib package and not the zlib package as distributed by Ubuntu. See How to fix? for Ubuntu:26.04 relevant fixed versions and status.

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 Base Scores

version 3.1