{"id":"UBUNTU-CVE-2026-28802","details":"Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.","modified":"2026-09-11T15:00:28.378935868Z","published":"2026-03-06T07:16:00Z","upstream":["CVE-2026-28802"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-28802"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-28802"},{"type":"REPORT","url":"https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75"},{"type":"REPORT","url":"https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7"},{"type":"REPORT","url":"https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8gg"}],"affected":[{"package":{"name":"python-authlib","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/python-authlib?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.1-1","1.5.2-1","1.6.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-authlib","binary_version":"1.6.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28802.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}