Vulnerability DatabaseCVE-2026-27171
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CVE-2026-27171
February 18, 2026
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.
Affected Packages
https://github.com/madler/zlib.git (GITHUB):
Affected version(s) >=v0.8 <v1.3.2
Fix Suggestion:
Update to version v1.3.2
Related Resources (5)
https://github.com/madler/zlib/releases/tag/v1.3.2
https://github.com/madler/zlib/issues/904
https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf
https://ostif.org/zlib-audit-complete/
https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/
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CVSS v4
Base Score:
2.1
Attack Vector
LOCAL
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
2.9
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Improper Validation of Specified Quantity in Input
CWE-1284
EPSS
Base Score:
0.01