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critical vulnerability

Authlib JWS JWK Header Injection: Signature Verification Bypass

Fix availableCritical · CVSS 9.1EPSS 0.56%

Published Mar 16, 2026 · updated Oct 27, 2026

What to do

  1. Upgrade to a fixed version: authlib 1.6.9.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIauthlib28,498,200 downloads/week

Vulnerable versions
<= 1.6.8
Fixed in
1.6.9

Check your project: pip show authlib

Sources

CWE-347 Improper Verification of Cryptographic Signature

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