GHSA-r995-q44h-hr64
Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling
At a glance
- Published
- Updated
- CVE
- CVE-2025-6442
- CVSS_V3
- CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
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.
Affected packages
| Package | Versions |
|---|---|
| RubyGems · webrick | introduced 0, fixed 1.8.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-6442 ADVISORY
- https://github.com/ruby/webrick/commit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101#diff-ad02984d873efb089aa51551bc6b7d307a53e0ba1ac439e91d69c2e58a478864 WEB
- https://github.com/ruby/webrick PACKAGE
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/webrick/CVE-2025-6442.yml WEB
- https://www.zerodayinitiative.com/advisories/ZDI-25-414 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |