VDB
CVE-2026-28490
CVE-2026-28490
PUBLISHED
CVSS 8.300000190734863 HIGH
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.
EPSS 0.02% · 3.8th percentile
Risk Scores
CVSS v4.0
8.300000190734863
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
EPSS Score
0.02%
3.8th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| PyPI | authlib | 0, 0, 0 |
| authlib | authlib | < 1.6.9, 0, 0 |
Timeline
- Mar 16, 2026 CVE Published
- Mar 16, 2026 PoC Published
- Mar 17, 2026 EPSS Score
- Mar 17, 2026 Coalition ESS Score
- Mar 17, 2026 Security Advisory
- Mar 18, 2026 EPSS Score
- Mar 19, 2026 EPSS Score
- Mar 20, 2026 EPSS Score
- Mar 21, 2026 EPSS Score
- Mar 22, 2026 EPSS Score
- Mar 23, 2026 EPSS Score
- Mar 24, 2026 EPSS Score
References
- https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78 url
- https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22 url
- https://github.com/authlib/authlib/releases/tag/v1.6.9 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-28490 advisory
- https://github.com/authlib/authlib package