CVE-2026-114616

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.

• CWE-287
• CWE-326
• CWE-1391

• https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b
• https://github.com/authlib/authlib/releases/tag/v1.9.1
• https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg

Published

Oct 22, 2026

Last Modified

Oct 22, 2026

Status

Received

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