HTTP Request Smuggling The advisory has been revoked - it doesn't affect any version of package rubygem-webrick.src (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-RUBYGEMWEBRICKSRC-15438955
- published7 Mar 2026
- disclosed25 Jun 2025
Introduced: 25 Jun 2025
CVE-2025-6442 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rubygem-webrick.src package and not the rubygem-webrick.src package as distributed by RHEL.
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.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2374895
- https://access.redhat.com/solutions/7139113
- https://access.redhat.com/security/cve/CVE-2025-6442
- https://github.com/ruby/webrick/commit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101#diff-ad02984d873efb089aa51551bc6b7d307a53e0ba1ac439e91d69c2e58a478864
- https://www.zerodayinitiative.com/advisories/ZDI-25-414/