ruby-oauth2 — security advisory

{
  "id": "d086b4cdd938bbce1cb0b58c8d5f668eba89be0e62ccdd1d915b57e21075a972",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-54603",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-54603",
    "summary": "OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect (OIDC). From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Client#request overrides the request authority, so the bearer Authorization header is sent to an attacker-controlled host, leaking the credential. This issue is fixed in version 2.0.22.",
    "evidence": "osv:DEBIAN-CVE-2026-54603",
    "products": [
      {
        "name": {
          "value": "ruby-oauth2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.4.4-1+deb12u1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.4.4-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "ruby-oauth2",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.0.17-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.0.18-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.0.25-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.0.9-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "ruby-oauth2",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.0.25-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.0.17-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.0.18-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.0.9-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-54603",
      "aliases": [
        "DEBIAN-CVE-2026-54603"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.4.4-1+deb12u1"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-oauth2",
            "purl": "pkg:deb/debian/ruby-oauth2?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "1.4.4-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54603.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-oauth2",
            "purl": "pkg:deb/debian/ruby-oauth2?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "2.0.17-1",
            "2.0.18-1",
            "2.0.25-1",
            "2.0.9-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54603.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.0.25-1"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-oauth2",
            "purl": "pkg:deb/debian/ruby-oauth2?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "2.0.17-1",
            "2.0.18-1",
            "2.0.9-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54603.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-24T09:47:32.112667648Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-54603"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-54603"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-54603",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429010,
  "published_at": "2026-07-28T17:16:52.227+00:00"
}