Access-control bypass via bare-LF header injection
Published Jul 28, 2026 · Updated Jul 28, 2026
HTTP request smuggling in Rouille 0.3.3 through 3.6.2 allows remote attackers to bypass proxy access controls through crafted headers. The proxy::proxy and proxy::full_proxy functions write client-controlled header values into upstream requests without rejecting embedded bare line feeds. Exploitation requires an application to proxy through Rouille to an LF-tolerant backend, allowing attacker-chosen requests and responses to bypass handler authentication or path checks.
Summary
What happened
HTTP request smuggling in Rouille 0.3.3 through 3.6.2 allows remote attackers to bypass proxy access controls through crafted headers. The proxy::proxy and proxy::full_proxy functions write client-controlled header values into upstream requests without rejecting embedded bare line feeds. Exploitation requires an application to proxy through Rouille to an LF-tolerant backend, allowing attacker-chosen requests and responses to bypass handler authentication or path checks.
The record
- CVE
- CVE-2026-67182
- Published
- Jul 28, 2026
- Updated
- Jul 28, 2026
- Vendor
- tomaka
- Product
- Rouille
- Classifications
- CWE-444, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 28, 2026CVE publishedPublication date reported by the CVE source.
- Jul 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.3.3 <=3.6.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- HTTP Request Smuggling Enables Front-End Access Control Bypass proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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