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 an
CVSS
7.4
High
EPSS
0.2%
p11
KEV
—
Exploit Today
3
0-100
Published: Oct 22, 2026 · Last modified: Oct 23, 2026 · CWE-287 · CWE-326 · CWE-1391
Not enough EPSS history yet.
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.