HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney_CVE-2026-47070

{
    "lastseen": "",
    "description": "Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackney_h3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request with follow_redirect enabled and includes Authorization or Cookie headers, a server responding with a 3xx redirect to a different host will cause the client to forward those credentials verbatim to the new origin.\n\nThe main hackney.erl module has maybe_strip_auth_on_redirect/2 (guarded by the location_trusted option) to address CVE-2018-1000007, but hackney_h3.erl is missing this protection entirely.\n\nThis issue affects hackney: from 3.1.1 before 4.0.1.",
    "published": "2026-05-25T14:00:46.420Z",
    "modified": "2026-05-25T14:00:46.420Z",
    "type": "cve",
    "title": "HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney",
    "source": "EEF",
    "references": "https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4\nhttps://cna.erlef.org/cves/CVE-2026-47070.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-47070\nhttps://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246",
    "id": "CVE-2026-47070",
    "bulletinFamily": "",
    "cwe": [
        "CWE-601"
    ],
    "cvelist": null,
    "sourceData": "benoitc hackney 3.1.1\nbenoitc hackney e61b7d04b7826847e1efe614106ef4d580c78eab",
    "sourceHref": "",
    "cvss": {
        "score": 6,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/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": "hackney",
    "version": "3.1.1",
    "vendor": "benoitc",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}