Security advisory

{
  "id": "42bb5b0f544041d10b2dfee42f2bfbdecbefebdcf578771e9c4276ec98c8df2b",
  "url": "https://osv.dev/vulnerability/CVE-2018-25091",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-25091",
    "summary": "urllib3 before 1.24.2 does not remove the authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the authorization header to be exposed to unintended hosts or transmitted in cleartext. NOTE: this issue exists because of an incomplete fix for CVE-2018-20060 (which was case-sensitive).",
    "evidence": "osv:CVE-2018-25091",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-25091",
      "aliases": [
        "CVE-2018-25091",
        "GHSA-gwvm-45gx-3cf8",
        "PYSEC-2023-207"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/urllib3/urllib3",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1efadf43dc63317cd9eaa3e0fdb9e05ab07254b1"
                },
                {
                  "fixed": "adb358f8e06865406d1f05e581a16cbea2136fbc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.24.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "adb358f8e06865406d1f05e581a16cbea2136fbc"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.24.1",
            "1.24",
            "1.23",
            "1.22",
            "1.21.1",
            "1.21",
            "1.20",
            "1.19",
            "1.18",
            "1.16",
            "1.15.1",
            "1.15",
            "1.14",
            "1.13.1",
            "1.13",
            "1.12",
            "1.11",
            "1.10.4",
            "1.10.3",
            "1.7.1",
            "1.7",
            "1.6",
            "1.5",
            "1.4",
            "1.3",
            "1.2.1",
            "1.2",
            "1.1",
            "0.4.1",
            "0.4",
            "0.3.1",
            "0.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-25091.json"
          }
        }
      ],
      "modified": "2026-10-20T10:50:25.396252407Z",
      "provider": "osv",
      "references": [
        "https://github.com/urllib3/urllib3/commit/adb358f8e06865406d1f05e581a16cbea2136fbc",
        "https://github.com/urllib3/urllib3/compare/1.24.1...1.24.2",
        "https://github.com/urllib3/urllib3/issues/1510"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-25091",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 381700,
  "published_at": "2023-10-15T19:15:09.213+00:00"
}