CVE-2026-27171 | BDVDB-2026-315971 Detail

zlibzlib

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact low. Attack vector: local.

Weaknesses#

CWE-1284 Improper Validation of Specified Quantity in Input

References#

Exploit#

No public exploit known

History#

Version 12026-02-18Record published in the CVE List.

Published

Published: 2026-02-18
Last modified: 2026-02-18

Vendor information

Vendor: zlib
Product: zlib

All zlib vulnerabilities

Score

2.9 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 16.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 1.3.2
Fixed
1.3.2

Scoring System

CVSS v4.0

Not available

CVSS v3.1

2.9 Low

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

Metric breakdown
Attack Vector	Local
Attack Complexity	High
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	Low

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).