CVE-2025-61919: Rack is vulnerable to a memory-exhaustion DoS through unbounded URL-encoded body parsing

CVE-2025-61919 · Severity: low · CVSS 3.1 · Published 2025-10-10

Rack is vulnerable to a memory-exhaustion DoS through unbounded URL-encoded body parsing

Technologies: rack (RubyGems). Vendors: RubyGems.

Quick answers

Is CVE-2025-61919 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-61919 being exploited in the wild.
How severe is CVE-2025-61919?
Low severity, with a CVSS score of 3.1, published 10 October 2025.
Which products and versions are affected?
rack (RubyGems) ECOSYSTEM:introduced=0,fixed=2.2.20.
Is there a fix for CVE-2025-61919?
Yes. rack (RubyGems): upgrade to 2.2.20 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-61919?
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 2.2.20 or later
    bundle update rack

Affected products

  • rack (RubyGems) ECOSYSTEM:introduced=0,fixed=2.2.20

Identifiers

  • CVE-2025-61919
  • GHSA-6xw4-3v39-52mm

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