CVE-2026-67181 – Rouille 0.3.3 – 3.6.2 HTTP Request Smuggling via proxy Transfer-Encoding Header

CVE ID :CVE-2026-67181

Published : July 28, 2026, 4:20 p.m. | 20 minutes ago

Description :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.

Severity: 7.2 | HIGH

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