CVE-2026-27171

2.9 LOW

Published: February 18, 2026 Modified: February 20, 2026

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/

Source: cve@mitre.org

Product

https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf

Source: cve@mitre.org

Technical Description

https://github.com/madler/zlib/issues/904

Source: cve@mitre.org

Issue Tracking Exploit

https://github.com/madler/zlib/releases/tag/v1.3.2

Source: cve@mitre.org

Release Notes

https://ostif.org/zlib-audit-complete/

Source: cve@mitre.org

Product

https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Technical Description

6 reference(s) from NVD

Quick Stats

CVSS v3 Score

2.9 / 10.0

EPSS (Exploit Probability)

0.0%

0th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-1284

Affected Vendors

zlib

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