EUVD-2026-30947
GHSA-9cfw-f3f9-7mm7
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionNVD
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
AnalysisAI
Remote code execution in APScheduler (all versions through 3.10.x and 4.0.0a5) is achievable when applications deserialize attacker-controlled data via the bundled JSONSerializer or CBORSerializer. The unmarshal_object routine dynamically imports modules and invokes __setstate__ on arbitrary classes, letting an attacker pivot an untrusted payload into code execution; publicly available exploit code exists, though EPSS remains low at 0.06% (19th percentile).
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RemediationAI
24 hours: Audit all systems running APScheduler versions ≤3.10.x or ≤4.0.0a5 to determine exposure and data sources. 7 days: For systems processing untrusted serialized input, immediately implement controls: disable JSONSerializer and CBORSerializer deserialization, restrict network access to APScheduler instances, or containerize with execution constraints. …
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