What’s Vulnerable › Vulnerabilities

CVE-2026-67182: Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-28 · updated 2026-10-23
• Weakness: CWE-444

Description

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.

Affected products

• tomaka rouille: from 0.3.3 through 3.6.2

References

• https://github.com/theopaid/HTTP-Request-Smuggling-Enables-Front-End-Access-Control-Bypass-rouille-
• https://www.vulncheck.com/advisories/rouille-http-request-smuggling-via-proxy-header-injection

Get alerted when CVE-2026-67182 or the next vulnerability affects your stack