CVEvulnerability

CVE-2026-114616

9.1 CRITICAL Published 2026-10-22 Modified 2026-10-30 Official page ↗
Status
Analyzed
Published
2026-10-22
Last modified
2026-10-30
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.4 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 3.1 ([email protected])
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-1391, CWE-287, CWE-326

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.

Affected configurations

• authlib authlib (< 1.9.1)

Related

Weakness · CWE (3)

  • CWE-1391 Use of Weak Credentials weakness
  • CWE-287 Improper Authentication weakness
  • CWE-326 Inadequate Encryption Strength weakness

References