CRITICALVulnerability
Verified
Global

NVD CRITICAL: CVE-2026-114616 — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior...

·Source: NIST NVD

Updated:

Executive Summary

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

Analysis

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. CVSS Score: 7.4. Published: 2026-10-22T22:18:04.420.

Indicators of Compromise (1)

CVE (1)
CVE-2026-114616
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Oct 22, 2026. Verified by: NIST.

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