CVE-2026-27171
2.9
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| zlib | zlib | 0 < 1.3.2 | affected |
Weaknesses
- CWE-1284: CWE-1284 Improper Validation of Specified Quantity in Input
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: no
- Technical Impact: partial
Additional References
References
- https://github.com/madler/zlib/issues/904
- https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf
- https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/
- https://ostif.org/zlib-audit-complete/
- https://github.com/madler/zlib/releases/tag/v1.3.2
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