CVE-2026-67181: medium-severity vulnerability in tomaka rouille
Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Transfer-Encoding Header
Published
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33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.3epss 0.4%
from disclosure to weaponsame day
Published on NVDJul 28
1st PoCJul 26
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
Affected products
tomaka · rouillepublic PoCs found — 2
githubgithub.com/theopaid/CVE-2026-67181-HTTP-Request-Smuggling-via-Transfer-Encoding-Desynchronization-rouille-★ 1cve_referencegithub.com/theopaid/HTTP-Request-Smuggling-via-Transfer-Encoding-Desynchronization-rouille-unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — tomaka rouille
In the same product, most dangerous first.
CVE-2026-67182MEDIUMRouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header InjectionEPSS 0.6%CVE-2026-66754HIGHRouille 0.1.6 - 3.6.2 Reachable Assertion DoS via remove_prefix percent-encodingEPSS 0.6%CVE-2026-66746MEDIUMRouille 0.4.0 - 3.6.2 HTTP Response Splitting via Header InjectionEPSS 0.3%