Critical severity9.8NVD Advisory· Published May 19, 2026· Updated Jul 24, 2026
CVE-2026-31072
CVE-2026-31072
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
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
apschedulerPyPI | >= 4.0.0a1, <= 4.0.0a6 | — |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-9cfw-f3f9-7mm7ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-31072ghsaADVISORY
- gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6nvdWEB
- access.redhat.com/security/cve/CVE-2026-31072nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31072.jsonnvd
News mentions
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