{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "3.1.1"
              },
              {
                "fixed": "4.0.1"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "84b8c43275921338f053e8212411dcf643d37cb8"
            },
            {
              "fixed": "c41c8d48ace8141b003f6f1de3ca6734a0c53056"
            },
            {
              "fixed": "c58d5b50bade146360b85caf3dc8065807b08246"
            }
          ],
          "repo": "https://github.com/benoitc/hackney",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h73q-4w9q-82h4"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47070.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "e61b7d04b7826847e1efe614106ef4d580c78eab"
          },
          {
            "fixed": "c58d5b50bade146360b85caf3dc8065807b08246"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "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.",
  "id": "CVE-2026-47070",
  "modified": "2026-07-08T05:37:46.037645161Z",
  "published": "2026-05-25T14:00:46.420Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-47070.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47070"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47070.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47070"
    },
    {
      "type": "FIX",
      "url": "https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/benoitc/hackney"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney"
}