CVE-2026-31072

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

Score

CVSS 3.1 9.8 Critical

Status

Deferred - cve@mitre.org

Published

2026-05-19

Last modified

2026-07-15

Weaknesses

CWE-502

Affected products

• Ansible Automation Platform (Redhat)
• Openstack (Redhat)
• Quay (Redhat)
• Satellite (Redhat)

References

• https://gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6
• https://github.com/agronholm/apscheduler
• https://access.redhat.com/security/cve/CVE-2026-31072
• https://bugzilla.redhat.com/show_bug.cgi?id=2479907
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31072.json