{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "1.23"
              },
              {
                "fixed": "2.7.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE"
            ]
          },
          "events": [
            {
              "introduced": "7c216f433e39e184b84cbfa49e41135a89e4baa0"
            },
            {
              "fixed": "9a950b92d999f906b6020bb2d1076ee56cddd5d2"
            }
          ],
          "repo": "https://github.com/urllib3/urllib3",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-qccp-gfcp-xxvc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-200"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44431.json"
  },
  "details": "urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.",
  "id": "CVE-2026-44431",
  "modified": "2026-07-15T01:49:02.178010510Z",
  "published": "2026-05-13T15:20:24.588Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2026/06/msg00040.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44431.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44431"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "urllib3: Sensitive headers forwarded across origins in proxied low-level redirects"
}