CVE-2026-47103: Python StateMachine versions 3.0.0 before 3.2.0 contains a remote code execution vulnerability that allows att

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-47103 is a critical-severity flaw (CVSS 9.8) affecting python statemachine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 h

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-95, CWE-94
Published	2026-06-17
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: fgmacedo

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 15:16 UTCPublished CVE record published
2026-10-26 12:10 UTCUpdated Record last modified

fgmacedo python statemachine UPGRADE

Affected: >= 3.0.0 and < 3.2.0

Fixed in: 3.2.0

Safe to downgrade to: a release before 3.0.0

1. Check installed version

pip show python-statemachine

2. UPGRADE to 3.2.0

pip install --upgrade "python-statemachine>=3.2.0"

3. If no update is available yet, DOWNGRADE to a release before 3.0.0

pip index versions python-statemachine pip install "python-statemachine<3.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Python (pip) · python-statemachine · FIXED · 3.2.0 · vulnerable: >= 3.0.0, < 3.2.0 · source

pip install --upgrade "python-statemachine>=3.2.0" pip show python-statemachine

Fedora 46 · flare-im · FIXED · 0.22.7-1.fc46 · FEDORA-2026-cd5e8062a1 · source

sudo dnf upgrade --advisory=FEDORA-2026-cd5e8062a1

Fedora ELN · libdnf · FIXED · 0.76.0-2.eln159 · FEDORA-2026-dbd263e9d4 · source

sudo dnf upgrade --advisory=FEDORA-2026-dbd263e9d4

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: SaiTeja-Erukude/CVE-2026-47103-python-statemachine-rce (0 stars)
Write-up: github.com/fgmacedo/python-statemachine/security/advisories/GHSA-v4jc-pm6r-3vj8

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47103?

python statemachine: upgrade to 3.2.0. Exact commands for each OS are on this page.

Is CVE-2026-47103 being exploited?

CVE-2026-47103 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47103 affect?

CVE-2026-47103 affects python statemachine. Severity is critical (CVSS 9.8). 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 evaluate

How urgent is CVE-2026-47103?

Priority 65/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

References

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