CVE-2026-27171

Published: Feb 18, 2026

Modified: Feb 18, 2026

PUBLISHED

CVSS v3.1

2.9

LOW

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.

Vendor	Product	Versions
zlib	zlib	affected `0 - < 1.3.2`

Weaknesses (CWE)

CWE-1284

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

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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CVE-2026-27171

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References