CVE-2026-67182
Rouille 0.3.3 through 3.6.2 contains an HTTP request smuggling vulnerability that allows remote attackers to bypass access controls by injecting bare line feed characters (0x0A) into client-supplied request header values that are copied verbatim to upstream connections without validation. Attackers can craft a header value containing a complete additional HTTP request that is interpreted as a separate request by backends such as Go net/http and Python http.server, causing the backend to process a smuggled request with attacker-chosen method, path, and headers that bypasses the rouille handler's access control logic.
- Score
- CVSS 3.1 7.5 High
- Status
- Deferred - disclosure@vulncheck.com
- Published
- 2026-07-28
- Last modified
- 2026-10-23
- Weaknesses
- CWE-444
Affected products
References
- https://github.com/theopaid/HTTP-Request-Smuggling-Enables-Front-End-Access-Control-Bypass-rouille-
- https://www.vulncheck.com/advisories/rouille-http-request-smuggling-via-proxy-header-injection
