CVE-2026-31072
CRITICAL EPSS 49.5%
Published May 19, 20261mo ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Published May 19, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago
Description
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
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
49.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-502 Deserialization of Untrusted Data Validation
References 2
- gist.github.com https://gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6
- github.com https://github.com/agronholm/apscheduler
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.