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Untriaged
Permalink CVE-2026-28802
created 1 month, 2 weeks ago Activity log
  • Created suggestion 1 month, 2 weeks ago
Authlib: Setting `alg: none` and a blank signature appears to bypass signature verification

Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.

Affected products

authlib
  • ==>= 1.6.5, < 1.6.7

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