Remote Code Execution in Python StateMachine SCXMLProcessor
CVE-2026-47103 is a remote code execution vulnerability in Python StateMachine affecting versions 3.0.0 before 3.2.0. The flaw is triggered when the application processes attacker-supplied SCXML documents containing crafted <data expr="..."> attributes. In the vulnerable code path, the SCXMLProcessor passes attacker-controlled expression strings through a call chain that ends in Python's built-in eval() without sandboxing or safe expression handling. As a result, arbitrary Python code embedded in the SCXML expression can be executed within the context of the hosting process.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
<data expr="..."> values. Additional hardening such as isolating the processing component can reduce blast radius, but the primary mitigation is upgrading to a fixed version.Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.