CVE-2025-6442: Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling

CVE-2025-6442 · Severity: low · CVSS 3 · Published 2025-06-26

Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling

Technologies: webrick (RubyGems). Vendors: RubyGems.

Quick answers

Is CVE-2025-6442 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-6442 being exploited in the wild.
How severe is CVE-2025-6442?
Low severity, with a CVSS score of 3, published 26 June 2025.
Which products and versions are affected?
webrick (RubyGems) ECOSYSTEM:introduced=0,fixed=1.8.2.
Is there a fix for CVE-2025-6442?
Yes. webrick (RubyGems): upgrade to 1.8.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-6442?
Check whether you run webrick (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

  • webrick (RubyGems): upgrade to 1.8.2 or later
    bundle update webrick

Affected products

  • webrick (RubyGems) ECOSYSTEM:introduced=0,fixed=1.8.2

Identifiers

  • CVE-2025-6442
  • GHSA-r995-q44h-hr64

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