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CVE-2026-27171

2.9 · LOW

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.

Published Feb 18, 2026CWE-1284EPSS 0.21%

Overview

CVE-2026-27171 is a low-severity vulnerability. It was published on February 18, 2026 and has a CVSS 3.1 base score of 2.9 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.9, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Ref7asecurity.com/blog/2026/02/zlib-7asecurity-audit/Ref7asecurity.com/reports/pentest-report-zlib-RC1.1.pdfGitHubgithub.com/madler/zlib/issues/904GitHubgithub.com/madler/zlib/releases/tag/v1.3.2Refostif.org/zlib-audit-complete/Ref7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2026-27171?

CVE-2026-27171 is a low-severity vulnerability. It was published on February 18, 2026 and has a CVSS 3.1 base score of 2.9 (LOW).

How severe is CVE-2026-27171?

This vulnerability has a CVSS 3.1 base score of 2.9, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-27171?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-27171?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27171 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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