CVE-2026-67182: medium-severity vulnerability in tomaka rouille
Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.9epss 0.6%
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 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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:L/SA:N
Affected products
tomaka · rouillepublic PoCs found — 2
githubgithub.com/theopaid/CVE-2026-67182-HTTP-Request-Smuggling-Enables-Front-End-Access-Control-Bypass-rouille-★ 0cve_referencegithub.com/theopaid/HTTP-Request-Smuggling-Enables-Front-End-Access-Control-Bypass-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-2026-66754HIGHRouille 0.1.6 - 3.6.2 Reachable Assertion DoS via remove_prefix percent-encodingEPSS 0.6%CVE-2026-67181MEDIUMRouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Transfer-Encoding HeaderEPSS 0.4%CVE-2026-66746MEDIUMRouille 0.4.0 - 3.6.2 HTTP Response Splitting via Header InjectionEPSS 0.3%