HTTP Request Smuggling Affecting ruby-webrick package, versions *
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-DEBIAN12-RUBYWEBRICK-10500695
- published26 Jun 2025
- disclosed25 Jun 2025
Introduced: 25 Jun 2025
NewCVE-2025-6442 (opens in a new tab)How to fix?
There is no fixed version for Debian:12 ruby-webrick.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby-webrick package and not the ruby-webrick package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.