{"id":"GHSA-9cfw-f3f9-7mm7","aliases":["CVE-2026-31072","PYSEC-2026-282"],"title":"APScheduler's JSONSerializer and CBORSerializer are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization","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","severity":"critical","score":9.8,"published":"2026-05-19T18:32:11.000Z","modified":"2026-10-27T16:15:05.357Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"PyPI","name":"apscheduler","ranges":[{"events":[{"introduced":"4.0.0a1"},{"last_affected":"4.0.0a6"}],"type":"ECOSYSTEM"}],"versions":["4.0.0a1","4.0.0a2","4.0.0a3","4.0.0a4","4.0.0a5","4.0.0a6"],"fixed":[]}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2026-31072","https://access.redhat.com/security/cve/CVE-2026-31072","https://bugzilla.redhat.com/show_bug.cgi?id=2479907","https://gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6","https://github.com/agronholm/apscheduler","https://github.com/pypa/advisory-database/tree/main/vulns/apscheduler/PYSEC-2026-282.yaml","https://pypi.org/project/apscheduler","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31072.json"],"sources":[{"name":"OSV","id":"GHSA-9cfw-f3f9-7mm7","modified":"2026-10-27T16:15:05.357367646Z","url":"https://osv.dev/vulnerability/GHSA-9cfw-f3f9-7mm7"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8}]}