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Vulnerabilities

CVE-2026-28490 | BDVDB-2026-320798 Detail

authlibauthlib

Description#

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.

Impact#

Per CVSS v4.0: confidentiality impact high, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

  • CWE-203 Observable Discrepancy
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.