CVE-2025-59822
Published: Sep 23, 2025
Modified: Sep 23, 2025
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.
| Vendor | Product | Versions |
|---|---|---|
http4s | http4s | affected < 0.23.31affected >= 1.0.0-M1, < 1.0.0-M45 |
Weaknesses (CWE)
References
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