{"id":"CVE-2026-28490","summary":"Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle","details":"Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9.","aliases":["GHSA-7432-952r-cw78","PYSEC-2026-2116"],"modified":"2026-08-12T03:30:34.442918124Z","published":"2026-03-16T17:37:57.425Z","related":["SUSE-SU-2026:0975-1","openSUSE-SU-2026:20392-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28490.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-203","CWE-327"]},"references":[{"type":"WEB","url":"https://github.com/authlib/authlib/releases/tag/v1.6.9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28490.json"},{"type":"ADVISORY","url":"https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28490"},{"type":"FIX","url":"https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/authlib/authlib","events":[{"introduced":"0"},{"fixed":"9266eaa2227ad7e21dc731b2a4a01909aabd934b"},{"fixed":"48b345f29f6c459f11c6a40162b6c0b742ef2e22"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.6.9"}]}}],"versions":["v1.6.8","v1.6.7","v1.6.6","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.1","v1.4.0","v1.3.2","v1.3.0","v1.2.1","v1.2.0","v1.1.0","v1.0.1","v1.0.0","v0.15","v0.14.3","v0.14.2","v0.14.1","v0.14","v0.13","v0.12","v0.11","v0.10","v0.9","v0.8","v0.7","v0.6","v0.5.1","v0.5","v0.4.1","v0.4","v0.3","v0.2.1","v0.2","v0.1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-28490.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"}]}