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CVE-2026-114616Authlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512)

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.

9.1 CRITICALEPSS 0.29%Not in KEVNVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
9.1CRITICAL3.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.4HIGH3.1GitHub_M (CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Details

CVE ID
CVE-2026-114616
Status
Analyzed
Assigner (CNA)
GitHub_M
Published
Oct 22, 2026
Last modified
2026-10-30 20:17 UTC
Weaknesses
  • CWE-287 · Improper Authentication
  • CWE-326 · Inadequate Encryption Strength
  • CWE-1391 · Use of Weak Credentials

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-09 08:28 UTC.