HTTP Request Smuggling Vulnerability in Rouille by Theopaid
CVE-2026-67182

6.9MEDIUM

Key Information:

Vendor

Tomaka

Status
Rouille
Vendor
CVE Published:
28 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-67182?

Rouille versions 0.3.3 to 3.6.2 are susceptible to an HTTP request smuggling issue. This vulnerability enables remote attackers to circumvent access control mechanisms by injecting bare line feed characters (0x0A) into the request header values. These headers are then sent to upstream connections without proper validation. An attacker can manipulate a header value to include an additional HTTP request that the backend, such as Go net/http and Python http.server, interprets as a separate request. This allows the attacker to execute unauthorized actions by choosing the method, path, and headers, effectively circumventing the access control implemented by Rouille.

Affected Version(s)

rouille 0.3.3 <= 3.6.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-67182 - Proof of Concept

References

https://github.com/theopaid/HTTP-Request-Smuggling-Enable...
technical-descriptionexploit
https://www.vulncheck.com/advisories/rouille-http-request...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Theodosis Paidakis
.