{"id":"DEBIAN-CVE-2026-54603","details":"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.","modified":"2026-10-01T03:03:27.081615884Z","published":"2026-07-28T17:16:52.227Z","upstream":["CVE-2026-54603"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-54603"}],"affected":[{"package":{"name":"ruby-oauth2","ecosystem":"Debian:12","purl":"pkg:deb/debian/ruby-oauth2?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.4-1","2.0.17-1","2.0.18-1","2.0.25-1","2.0.7-1","2.0.7-2","2.0.9-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54603.json"}},{"package":{"name":"ruby-oauth2","ecosystem":"Debian:13","purl":"pkg:deb/debian/ruby-oauth2?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.17-1","2.0.18-1","2.0.25-1","2.0.9-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54603.json"}},{"package":{"name":"ruby-oauth2","ecosystem":"Debian:14","purl":"pkg:deb/debian/ruby-oauth2?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.25-1"}]}],"versions":["2.0.17-1","2.0.18-1","2.0.9-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54603.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"}]}