{"id":"CVE-2026-31072","aliases":["PYSEC-2026-282"],"url":"https://o3.security/vulnerability/CVE-2026-31072","summary":"APScheduler's JSONSerializer and CBORSerializer are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization","details":"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","published":"2026-05-19T18:32:11Z","modified":"2026-06-29T12:26:23.761869846Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.0081,"percentile":0.53877,"asOf":"2026-08-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"apscheduler","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31072"},{"type":"WEB","url":"https://gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6"},{"type":"PACKAGE","url":"https://github.com/agronholm/apscheduler"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-06-29T12:26:23.761869846Z"}}