CVE-2026-27171

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.

Affected Platforms

Weakness Type

CWE-1284

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