CVE-2026-47103: Fgmacedo Python Statemachine

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

Python StateMachine versions 3.0.0 before 3.2.0 contains a remote code execution vulnerability that allows attackers to execute arbitrary code by supplying malicious SCXML documents containing crafted `<data expr="...">` attributes evaluated unsafely. The SCXMLProcessor passes attacker-controlled expression strings through a call chain ending in Python's built-in eval() without sandboxing, enabling arbitrary code execution in the context of the hosting process.

Affected products

• Fgmacedo Python Statemachine: from 3.0.0, before 3.2.0 (fixed in 3.2.0)

Published 2026-06-17. Last modified 2026-10-08.