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CVE-2026-27171NVD
Vulnerability Summary
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 v3.1 Base Metrics
Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityLow
External References
- https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/
- https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf
- https://github.com/madler/zlib/issues/904
- https://github.com/madler/zlib/releases/tag/v1.3.2
- https://ostif.org/zlib-audit-complete/
- https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf