HTTP Request Smuggling Affecting webrick package, versions <1.8.2
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-RUBY-WEBRICK-10500756
- published26 Jun 2025
- disclosed25 Jun 2025
- credityadhukrishnam
Introduced: 25 Jun 2025
NewCVE-2025-6442 (opens in a new tab)How to fix?
Upgrade webrick to version 1.8.2 or higher.
Overview
webrick is a HTTP server toolkit that can be configured as an HTTPS server, a proxy server, and a virtual-host server.
Affected versions of this package are vulnerable to HTTP Request Smuggling via the read_headers method. An attacker can exploit inconsistent parsing of HTTP header terminators to inject arbitrary HTTP requests.
Note:
This is only exploitable if the application is deployed behind an HTTP proxy that fulfils specific conditions.