Sign in Sign up
JA · EN · FR
SecPulse
Categories
CVE-2026-47103 critical CVSS 9.8

Vulnerability in python-statemachine (CVE-2026-47103)

Summary

Vulnerability in python-statemachine (CVE-2026-47103). Successful exploitation can lead to full system takeover. Exploitable via SCXMLProcessor. Mitigation: upgrade to 3.2.0 or later.

Original description

The description as published by the source.

Summary

python-statemachine 3.1.2 evaluates `` 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 `` 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:
   

 3. Run:
   SCXMLProcessor.parse_scxml_file(DATA_EXPR_CHART)
   SCXMLProcessor.start()
 
4. During start(),  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.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-47103 has been found in python-statemachine.
Attackers can target a specific entry point like SCXMLProcessor over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: upgrade python-statemachine to 3.2.0 or later.
If unsure, ask your IT team or search "python-statemachine CVE-2026-47103" on the vendor's site.

CVE-2026-47103 (python-statemachine) — CWE-95 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: SCXMLProcessor / expr
Patched: 3.2.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-95) exists in python-statemachine. Attackers reach the vulnerable code path via SCXMLProcessor without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of python-statemachine. Attack surface: SCXMLProcessor / expr.

🔥 Severity

Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 3.2.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'python-statemachine' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'python-statemachine' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で python-statemachine を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade python-statemachine to 3.2.0

    ステージング環境で 3.2.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip python-statemachine
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.0"}]}]
PyPI python-statemachine
[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.2.0"}]}]

References

We use cookies for analytics and ad measurement. This setting applies to all Game co., Ltd. sites. Details