CVE-2026-31072
Critical · 9.8CVSS
9.8
EPSS
1.0%
Published
May 19, 2026
CISA due date
—
The record
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
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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