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ExploitedPHP2Shell is now on CISA KEV

critical vulnerability

APScheduler's JSONSerializer and CBORSerializer are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization

No fix yetCritical · CVSS 9.8EPSS 0.81%

Published May 19, 2026 · updated Oct 27, 2026

What to do

  1. Some affected packages have no fixed version yet: follow the advisory for mitigations and watch this page for the fix.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIapscheduler9,905,763 downloads/week

Vulnerable versions
>= 4.0.0a1, <= 4.0.0a6
Fixed in
no fix yet

Check your project: pip show apscheduler

Sources

CWE-502 Deserialization of Untrusted Data

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