What’s Vulnerable › Vulnerabilities

CVE-2026-47103: Python StateMachine 3.0.0 < 3.2.0 RCE via SCXML eval() Injection

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-17 · updated 2026-10-26
• Weakness: CWE-95

Description

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

How to fix

Upgrade to a fixed version: fgmacedo python-statemachine 3.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/SaiTeja-Erukude/CVE-2026-47103-python-statemachine-rce
• https://github.com/fgmacedo/python-statemachine/releases/tag/v3.2.0
• https://github.com/fgmacedo/python-statemachine/security/advisories/GHSA-v4jc-pm6r-3vj8
• https://www.vulncheck.com/advisories/python-statemachine-rce-via-scxml-eval-injection
• https://github.com/fgmacedo/python-statemachine/security/advisories/GHSA-v4jc-pm6r-3vj8

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