{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.3.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "347507ac5b51f48c2933bbe49b2ee07c2af4712b"
            }
          ],
          "repo": "https://github.com/openidc/liboauth2",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "CERT-PL",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54430.json"
  },
  "details": "liboauth2 is vulnerable to Server-Side Request Forgery in oauth2_jose_jwks_aws_alb_resolve() function. The AWS ALB verifier reads both signer and kid from the unverified JWT\nheader. If signer matches the configured ARN, kid is appended to\nalb_base_url without URL encoding or path sanitization, and the HTTP GET\nis issued before signature verification. This allows an attacker to force\nthe server to send a GET request to an attacker-chosen internal path.\n\nThis issue was fixed in version 2.3.0",
  "id": "CVE-2026-54430",
  "modified": "2026-07-15T01:48:58.719677887Z",
  "published": "2026-07-02T10:30:33.766Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://cert.pl/en/posts/2026/07/CVE-2026-54430"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54430.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54430"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/OpenIDC/liboauth2"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Server-Site Request Forgery in liboauth2"
}