python-authlib: Authlib is a Python library which builds OAuth and OpenID Connect servers
CVE-2026-28490 is fixed in 3 products on 1 platform, first by python3-authlib 0.15.5-1ubuntu0.1~esm2, released March 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-Authlib · opensuse-leap 15.6 | 1.3.1-150600.3.17.1 | SUSE-SU-2026:0975-1 | Mar 23, 2026 |
| python-Authlib · opensuse-leap 16.0 | 1.5.2-bp160.3.1 | OPENSUSE-SU-2026:20392-1 | Mar 18, 2026 |
| python-Authlib · sles 15.6 | 1.3.1-150600.3.17.1 | SUSE-SU-2026:0975-1 | Mar 23, 2026 |
| python-Authlib · sles 15.7 | 1.3.1-150600.3.17.1 | SUSE-SU-2026:0975-1 | Mar 23, 2026 |
| python-authlib · Debian 12.15 (bookworm) | 1.2.0-1+deb12u2 | DEBIAN-CVE-2026-28490 | Mar 16, 2026 |
| python-authlib · Debian 14 | 1.6.9-1 | DEBIAN-CVE-2026-28490 | Mar 16, 2026 |
| python3-authlib · Ubuntu 22.04.1 LTS (jammy) | 0.15.5-1ubuntu0.1~esm2 | python3-authlib 0.15.5-1ubuntu0.1~esm2 | Mar 16, 2026 |
| python3-authlib · Ubuntu 24.04.5 LTS (noble) | 1.3.0-1ubuntu0.1~esm2 | python3-authlib 1.3.0-1ubuntu0.1~esm2 | Apr 24, 2026 |
| python3-authlib · Ubuntu 26.04.1 LTS (resolute) | 1.6.7-1ubuntu0.1~esm1 | python3-authlib 1.6.7-1ubuntu0.1~esm1 | Apr 24, 2026 |
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