CVE-2025-59830: Rack has an unsafe default in Rack::QueryParser allows params_limit bypass via semicolon-separated parameters

CVE-2025-59830 · Severity: low · CVSS 3.1 · Published 2025-09-25

Rack has an unsafe default in Rack::QueryParser allows params_limit bypass via semicolon-separated parameters

Technologies: rack (RubyGems). Vendors: RubyGems.

Quick answers

Is CVE-2025-59830 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-59830 being exploited in the wild.
How severe is CVE-2025-59830?
Low severity, with a CVSS score of 3.1, published 25 September 2025.
Which products and versions are affected?
rack (RubyGems) ECOSYSTEM:introduced=0,fixed=2.2.18.
Is there a fix for CVE-2025-59830?
Yes. rack (RubyGems): upgrade to 2.2.18 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-59830?
Check whether you run rack (RubyGems) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • rack (RubyGems): upgrade to 2.2.18 or later
    bundle update rack

Affected products

  • rack (RubyGems) ECOSYSTEM:introduced=0,fixed=2.2.18

Identifiers

  • CVE-2025-59830
  • GHSA-625h-95r8-8xpm

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