CVE-2026-27171

zlib: zlib: Denial of Service via infinite loop in CRC32 combine functions

Published Feb 18, 2026 CVSS 3.1 · 2.9 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Title zlib: zlib: Denial of Service via infinite loop in CRC32 combine functions
Weaknesses CWE-835
References
Metrics threat_severity

None

threat_severity

Low

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
First Time appeared Zlib
Zlib zlib
Weaknesses CWE-1284
CPEs cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*
Vendors & Products Zlib
Zlib zlib
References
Metrics cvssV3_1

{'score': 2.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Feb 18, 2026, 1:38 PM
Reserved
Feb 18, 2026, 2:36 AM
Status
Analyzed
Published
Feb 18, 2026, 4:16 AM
Modified
Jun 17, 2026, 10:26 AM
Severity
Low
Public date
Feb 18, 2026, 2:36 AM