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    CVE-2026-28490

    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.

    Published:Mar 16, 2026
    Last Modified:Mar 24, 2026
    EPS:Mar 16, 2026
    EPSS Score:0.00011
    CVSS Score:6.5

    Affected Products

    Vendor
    Authlib
    Product
    Authlib

    Exploits

    https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78

    Related CVEs

    CVE-2026-41479 (CVSS 5.4) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib'…
    CVE-2026-44681 (CVSS 6.1) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.12 and 1.7.1, an unaut…
    CVE-2026-41425 (CVSS 5.4) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.11, there is no CSRF p…
    CVE-2026-28498 (CVSS 8.2) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-l…
    CVE-2026-27962 (CVSS 9.1) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Heade…
    CVE-2026-28802 (CVSS 7.7) — Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before versio…
    CVE-2025-68158 (CVSS 5.7) — Authlib is a Python library which builds OAuth and OpenID Connect servers. In versions 1.0.0 through 1.6.5, ca…
    CVE-2025-62706 (CVSS 6.5) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s J…
    CVE-2025-61920 (CVSS 7.5) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s J…
    CVE-2025-59420 (CVSS 7.5) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, Authlib’s J…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High