CVE-2026-27171

MEDIUM EPSS 10.4%
Published Feb 18, 20264mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 18, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
10.4% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-1284

Affected Products 1

VendorProductVersionRange
zlibzlib*≥1.2.12  –  <1.3.2

References 5

  • 7asecurity.com https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/
    Product
  • 7asecurity.com https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf
    Technical Description
  • github.com https://github.com/madler/zlib/issues/904
    ExploitIssue Tracking
  • github.com https://github.com/madler/zlib/releases/tag/v1.3.2
    Release Notes
  • ostif.org https://ostif.org/zlib-audit-complete/
    Product

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.