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ExploitedPHP2Shell is now on CISA KEV

critical vulnerability

Authlib: empty signatures validation in JWS JSON deserialization

Fix availableCritical · CVSS 9.1EPSS 0.38%

Published Oct 27, 2026 · updated Oct 27, 2026

What to do

  1. Upgrade to a fixed version: authlib 1.9.0.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIauthlib28,498,200 downloads/week

Vulnerable versions
<= 1.8.0
Fixed in
1.9.0

Check your project: pip show authlib

What changed

  1. Oct 27, 2026

    Published in the GitHub Advisory Database as critical.

Sources

CWE-347 Improper Verification of Cryptographic Signature

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