Http4s is a Scala interface for HTTP services. In versions from 1.0.0-M1 to before 1.0.0-M45 and before 0.23.31, http4s is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section. This vulnerability could enable attackers to bypass front-end servers security controls, launch targeted attacks against active users, and poison web caches. A pre-requisite for exploitation involves the web application being deployed behind a reverse-proxy that forwards trailer headers. This issue has been patched in versions 1.0.0-M45 and 0.23.31.
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Thu, 25 Sep 2025 08:30:00 +0000
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Description | Http4s is a Scala interface for HTTP services. In versions from 1.0.0-M1 to before 1.0.0-M45 and before 0.23.31, http4s is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section. This vulnerability could enable attackers to bypass front-end servers security controls, launch targeted attacks against active users, and poison web caches. A pre-requisite for exploitation involves the web application being deployed behind a reverse-proxy that forwards trailer headers. This issue has been patched in versions 1.0.0-M45 and 0.23.31. | |
Title | Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section | |
Weaknesses | CWE-444 | |
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cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-09-23T18:54:42.867Z
Updated: 2025-09-23T19:17:26.320Z
Reserved: 2025-09-22T14:34:03.470Z
Link: CVE-2025-59822

Updated: 2025-09-23T19:15:06.063Z

Status : Awaiting Analysis
Published: 2025-09-23T19:15:42.303
Modified: 2025-09-24T18:11:24.520
Link: CVE-2025-59822

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