CVE-2026-67182

HIGH 7.5

Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-444
Vendor	tomaka
Product	rouille
Published	Jul 28, 2026
Last Updated	Jul 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

Low

Affected Versions

tomaka / rouille

0.3.3 ≤ 3.6.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Theodosis Paidakis