Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.9epss 0.4%
from disclosure to weapon0 days
Published on NVDJul 28
1st PoCJul 26
exploitation probability
0.4%top 66% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
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.