CVE-2026-67181: Tomaka Rouille

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Rouille 0.3.3 through 3.6.2 contains an HTTP request smuggling vulnerability that allows remote attackers to desynchronize HTTP message boundaries by exploiting improper header forwarding in the proxy implementation. The proxy in src/proxy.rs forwards the client's Transfer-Encoding header to upstream backends unchanged while transmitting a body already de-chunked by tiny_http, enabling CL.TE desynchronization attacks where attackers control where the backend believes the request body ends.

Affected products

• Tomaka Rouille: from 0.3.3, up to and including 3.6.2

Published 2026-07-28. Last modified 2026-07-30.