Vulnerability in Zlib
CVE-2026-27171
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.
EPSS: 0.002 (12.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 2.9 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Zlib — versions 0
Weakness classification (CWE)
References
- cve@mitre.org (Exploit, Issue Tracking)
- cve@mitre.org (Technical Description)
- cve@mitre.org (Product)
- cve@mitre.org (Product)
- cve@mitre.org (Release Notes)
Frequently asked questions
- What is CVE-2026-27171?
- CVE-2026-27171 is a low-severity vulnerability in Zlib, classified under Improper Validation of Specified Quantity in Input. CVSS score: 2.9/10. Published 2026-02-18.
- How severe is CVE-2026-27171?
- Low severity. CVSS v3 base score is 2.9 out of 10.