CVE-2026-31072

CRITICAL 9.8

CVSS Score

9.8

EPSS Score

0.1%

EPSS Percentile

19th

The JSONSerializer and CBORSerializer in APScheduler (all versions including 3.10.x and 4.0.0a5) are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization. The unmarshal_object function allows for arbitrary class instantiation and state injection by dynamically importing modules and calling __setstate__ on any class available in the Python environment. An attacker can exploit this by submitting a specially crafted JSON or CBOR payload to an application using these serializers

Vendor	n/a
Product	n/a
Published	May 19, 2026
Last Updated	May 20, 2026

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Affected Versions

n/a / n/a

n/a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/agronholm/apscheduler gist.github.com: https://gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6