CVE-2026-42867

{
  "id": "CVE-2026-42867",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-23T17:16:58.857",
  "lastModified": "2026-10-26T11:10:00.157",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow is vulnerable to Path Traversal in the Knowledge Bases API (POST /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks. An authenticated attacker can exploit this flaw to create directories and write files anywhere on the server's filesystem. This vulnerability is fixed in 1.9.0."
    },
    {
      "lang": "es",
      "value": "Langflow es una herramienta para construir y desplegar agentes y flujos de trabajo impulsados por IA. Antes de la 1.9.0, Langflow es vulnerable a salto de ruta en la API de Bases de Conocimiento (POST /api/v1/knowledge_bases). Esto ocurre porque los nombres de bases de conocimiento proporcionados por el usuario se utilizan directamente para crear rutas de archivo sin una sanitización o comprobaciones de contención adecuadas. Un atacante autenticado puede explotar esta falla para crear directorios y escribir archivos en cualquier lugar del sistema de archivos del servidor. Esta vulnerabilidad está corregida en la 1.9.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "langflow-ai",
          "product": "langflow",
          "versions": [
            {
              "version": "< 1.9.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-23T17:01:29.364041Z",
          "id": "CVE-2026-42867",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "1.9.0",
              "matchCriteriaId": "D51A889E-5C89-4A92-B32B-C91EAF735430"
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  ],
  "references": [
    {
      "url": "https://github.com/langflow-ai/langflow/pull/12337",
      "source": "[email protected]",
      "tags": [
        "Patch",
        "Issue Tracking"
      ]
    },
    {
      "url": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
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}