Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section_CVE-2025-59822

{
    "lastseen": "",
    "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.",
    "published": "2025-09-23T18:54:42.867Z",
    "modified": "2025-09-23T19:17:26.320Z",
    "type": "cve",
    "title": "Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section",
    "source": "GitHub_M",
    "references": "https://github.com/http4s/http4s/security/advisories/GHSA-wcwh-7gfw-5wrr\nhttps://github.com/http4s/http4s/commit/dd518f7c967e5165813b8d4a48a82b8fab852d41",
    "id": "CVE-2025-59822",
    "bulletinFamily": "",
    "cwe": [
        "CWE-444"
    ],
    "cvelist": null,
    "sourceData": "http4s http4s < 0.23.31\nhttp4s http4s >= 1.0.0-M1, < 1.0.0-M45",
    "sourceHref": "",
    "cvss": {
        "score": 6.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "http4s",
    "version": "< 0.23.31",
    "vendor": "http4s",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}