CVE-2025-59830

HIGH EPSS 41.1%
Published Sep 25, 20259mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Sep 25, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

Description

Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
41.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-400 Uncontrolled Resource Consumption Resource Mgmt
CWE-770

Affected Products 1

VendorProductVersionRange
rackrack* <2.2.18

References 2

  • github.com https://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71
    Patch
  • github.com https://github.com/rack/rack/security/advisories/GHSA-625h-95r8-8xpm
    MitigationVendor Advisory

Remediation

  • github.com https://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71
    Patch