CVE-2026-9135

{
  "id": "CVE-2026-9135",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-17T19:17:19.390",
  "lastModified": "2026-10-24T20:10:00.137",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "IBM Langflow OSS 1.0.0 through 1.10.0 Langflow versions up to 1.9.2 (commit 94981c443d4918517b9e8163d70fc598dc33a32d) contain a code injection vulnerability in the Policies component's ToolGuard integration that bypasses the allow_custom_components=false security control. The vulnerability exists because the validation mechanism only checks the main component source code in node_template[\"code\"][\"value\"] but fails to validate dynamic CodeInput fields that store generated ToolGuard Python files. Attackers can embed malicious Python code in these unvalidated dynamic fields, which are persisted in Flow.data and later executed server-side when a guarded tool is invoked through the ToolGuard runtime. This allows authenticated users with flow creation privileges to achieve arbitrary Python code execution on the backend despite custom component restrictions. The vulnerability can be escalated through cross-tenant flow manipulation via the agentic MCP update_flow_component_field tool, which accepts attacker-controlled user_id parameters, enabling attackers to inject malicious code into victim users' flows. When combined with publicly accessible flows and specific misconfigurations (AUTO_LOGIN=true, NEW_USER_IS_ACTIVE=true), the attack can be conducted with reduced authentication requirements."
    },
    {
      "lang": "es",
      "value": "Las versiones de IBM Langflow OSS 1.0.0 a 1.10.0 y Langflow hasta la 1.9.2 (commit 94981c443d4918517b9e8163d70fc598dc33a32d) contienen una vulnerabilidad de inyección de código en la integración de ToolGuard del componente Policies que elude el control de seguridad allow_custom_components=false. La vulnerabilidad existe porque el mecanismo de validación solo verifica el código fuente del componente principal en node_template[’code’][’value’] pero no valida los campos dinámicos CodeInput que almacenan archivos Python de ToolGuard generados. Los atacantes pueden incrustar código Python malicioso en estos campos dinámicos no validados, que se persisten en Flow.data y luego se ejecutan en el lado del servidor cuando se invoca una herramienta protegida a través del tiempo de ejecución de ToolGuard. Esto permite a los usuarios autenticados con privilegios de creación de flujos lograr la ejecución arbitraria de código Python en el backend a pesar de las restricciones de componentes personalizados. La vulnerabilidad puede ser escalada a través de la manipulación de flujos entre inquilinos mediante la herramienta agentic MCP update_flow_component_field, que acepta parámetros user_id controlados por el atacante, permitiendo a los atacantes inyectar código malicioso en los flujos de los usuarios víctimas. Cuando se combina con flujos de acceso público y configuraciones erróneas específicas (AUTO_LOGIN=true, NEW_USER_IS_ACTIVE=true), el ataque puede llevarse a cabo con requisitos de autenticación reducidos."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "IBM",
          "product": "Langflow OSS",
          "cpes": [
            "cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:langflow_oss:1.10.0:*:*:*:*:*:*:*"
          ],
          "versions": [
            {
              "version": "1.0.0",
              "lessThanOrEqual": "1.10.0",
              "versionType": "semver",
              "status": "affected"
            }
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        }
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    }
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          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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          "id": "CVE-2026-9135",
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  "references": [
    {
      "url": "https://www.ibm.com/support/pages/node/7278920",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
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    }
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}