CVE-2026-67182 Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection
Attackers can bypass access controls and smuggle requests in Rouille by injecting line feeds into headers, affecting Rust applications using this library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-67182?
CVE-2026-67182 is a medium-severity vulnerability in tomaka rouille, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-444
Which versions are affected by CVE-2026-67182?
How do I fix CVE-2026-67182?
Upgrade to a fixed version.
Is CVE-2026-67182 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67182 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as DEBIAN-CVE-2026-67182, GHSA-frmw-v2hf-gvj9.