Description

Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.

INFO

Published Date :

2025-06-25T16:52:24.625Z

Last Modified :

2025-06-25T20:42:41.093Z

Source :

zdi
AFFECTED PRODUCTS

The following products are affected by CVE-2025-6442 vulnerability.

Vendors Products
Ruby
  • Webrick
Ruby-lang
  • Webrick
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-6442.

URL Resource
https://github.com/ruby/webrick/commit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101#diff-ad02984d873efb089aa51551bc6b7d307a53e0ba1ac439e91d69c2e58a478864 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-6442 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-6442 cve-icon
https://www.zerodayinitiative.com/advisories/ZDI-25-414/ cve-icon cve-icon cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact