CVE-2026-114616 | BDVDB-2026-394537 Detail

Description#

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute the deterministic HS256, HS384, or HS512 signature for arbitrary token claims and have Authlib treat the token as authentic. This issue is fixed in version 1.9.1.

Impact#

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Exploit#

History#

1. Version 12026-10-22Record published in the CVE List.
2. Version 22026-10-30Most recent update recorded in the CVE List.