Ruby WEBrick read_header HTTP Request Smuggling Vulnerability
Summary
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2025-6442 ruby-webrick
- Ubuntu UBUNTU-CVE-2025-6442 jruby
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- advisory zerodayinitiative.com