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    CVE-2025-59822

    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.

    Published:Sep 23, 2025
    Last Modified:Oct 8, 2025
    EPS:Sep 23, 2025
    EPSS Score:0.00055
    CVSS Score:7.5

    Affected Products

    Vendor
    Http4s
    Product
    Http4s
    Vendor
    Typelevel
    Product
    Http4s

    Exploits

    https://github.com/http4s/http4s/security/advisories/GHSA-wcwh-7gfw-5wrrhttps://github.com/http4s/http4s/security/advisories/GHSA-wcwh-7gfw-5wrr

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High