What is CVE-2026-47103?

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 ` ` 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.

How severe is CVE-2026-47103?

CVE-2026-47103 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-47103 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47103?

CVE-2026-47103 affects Fgmacedo Python Statemachine. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-47103?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-47103 have an EU (EUVD) identifier?

Yes. CVE-2026-47103 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37730.

When was CVE-2026-47103 published?

CVE-2026-47103 was published on 2026-06-17 and last updated on 2026-07-08.

CVE-2026-47103

CVE-2026-47103 is a critical-severity vulnerability in Fgmacedo Python Statemachine with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37730
Weakness: CWE-94
Affected product: Fgmacedo Python Statemachine
Published: 2026-06-17
Last modified: 2026-07-08

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.

Frequently asked questions

What is CVE-2026-47103?: 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.
How severe is CVE-2026-47103?: CVE-2026-47103 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-47103 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47103?: CVE-2026-47103 affects Fgmacedo Python Statemachine. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-47103?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-47103 have an EU (EUVD) identifier?: Yes. CVE-2026-47103 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37730.
When was CVE-2026-47103 published?: CVE-2026-47103 was published on 2026-06-17 and last updated on 2026-07-08.

References

Affected products (1)

cpe:2.3:a:fgmacedo:python_statemachine:*:*:*:*:*:python:*:*

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