{"id":"CVE-2026-54430","summary":"Server-Site Request Forgery in liboauth2","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","modified":"2026-07-15T01:48:58.719677887Z","published":"2026-07-02T10:30:33.766Z","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"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openidc/liboauth2","events":[{"introduced":"0"},{"fixed":"347507ac5b51f48c2933bbe49b2ee07c2af4712b"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.3.0"}]}}],"versions":["v2.2.1","v2.2.0","v2.1.1","v2.1.0","v2.0.0","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.5.5","v1.4.5.4","v1.4.5.3","v1.4.5.2","v1.4.5.1","v1.4.5","v1.4.4.2","v1.4.4.1","v1.4.4","v1.4.3.2","v1.4.3.1","v1.4.3","v1.4.2.1","v1.4.2","v1.4.1","v1.4.0.1","v1.4.0","v1.3.0","v1.1.1","v1.1.0","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54430.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","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"}]}