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Flowise: RCE via CSVAgent csvFile data URI base64 segment is interpolated into Python source without validation

Type: advisorySources: OSV

Prior to 3.1.3, Flowise CSVAgent interpolates an attacker-controlled segment of the csvFile data URI directly into a Python source-code template that is then executed by Pyodide. Because Pyodide is loaded with the default js bridge to globalThis, which on Node.js exposes eval and dynamic import, the attacker can break out of the Python string literal, hand a JavaScript string to js.eval, dynamically import Node built-in modules such as fs and child_process, and execute arbitrary file I/O or OS commands as the Flowise process. The two validator paths around this code, validatePythonCodeForDataFrame and validateCustomReadCSVFunction, are never applied to the bootstrap template. A workspace user with chatflows:create or agentflows/chatflows update permission can plant a CSV Agent node with a crafted csvFile; once the chatflow is exposed via POST /api/v1/prediction/:id, any unauthenticated request triggers host remote code execution. This issue is fixed in version 3.1.3.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-69264
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 06:41 UTC · Revision 1

Source evidence

Flowise: RCE via CSVAgent csvFile data URI base64 segment is interpolated into Python source without validation

core-osv · Original source

Published 4 Aug 2026, 17:22 UTC

Prior to 3.1.3, Flowise CSVAgent interpolates an attacker-controlled segment of the csvFile data URI directly into a Python source-code template that is then executed by Pyodide. Because Pyodide is loaded with the default js bridge to globalThis, which on Node.js exposes eval and dynamic import, the attacker can break out of the Python string literal, hand a JavaScript string to js.eval, dynamically import Node built-in modules such as fs and child_process, and execute arbitrary file I/O or OS commands as the Flowise process. The two validator paths around this code, validatePythonCodeForDataFrame and validateCustomReadCSVFunction, are never applied to the bootstrap template. A workspace user with chatflows:create or agentflows/chatflows update permission can plant a CSV Agent node with a crafted csvFile; once the chatflow is exposed via POST /api/v1/prediction/:id, any unauthenticated request triggers host remote code execution. This issue is fixed in version 3.1.3.

osv:CVE-2026-69264
Complete source record
{
  "id": "856430baf0b9d528bd47bc1dc42106b497ecbcbae8a84110d5ff9a254d9ff2b4",
  "url": "https://osv.dev/vulnerability/CVE-2026-69264",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Flowise: RCE via CSVAgent csvFile data URI base64 segment is interpolated into Python source without validation",
    "summary": "Prior to 3.1.3, Flowise CSVAgent interpolates an attacker-controlled segment of the csvFile data URI directly into a Python source-code template that is then executed by Pyodide. Because Pyodide is loaded with the default js bridge to globalThis, which on Node.js exposes eval and dynamic import, the attacker can break out of the Python string literal, hand a JavaScript string to js.eval, dynamically import Node built-in modules such as fs and child_process, and execute arbitrary file I/O or OS commands as the Flowise process. The two validator paths around this code, validatePythonCodeForDataFrame and validateCustomReadCSVFunction, are never applied to the bootstrap template. A workspace user with chatflows:create or agentflows/chatflows update permission can plant a CSV Agent node with a crafted csvFile; once the chatflow is exposed via POST /api/v1/prediction/:id, any unauthenticated request triggers host remote code execution. This issue is fixed in version 3.1.3.",
    "evidence": "osv:CVE-2026-69264",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-69264",
      "aliases": [
        "CVE-2026-69264",
        "GHSA-4j8x-x6v7-w9rq"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/flowiseai/flowise",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "09f099dbfda179e439ec677d06ad737375899eef"
                },
                {
                  "fixed": "f4e2794f6a576b94578f2fdafbf49c2fb304626c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f4e2794f6a576b94578f2fdafbf49c2fb304626c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
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                    "range": [
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                    "source": "REFERENCES_TAG",
                    "original_tag": "flowise@3.1.3"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69264.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.906388529Z",
      "provider": "osv",
      "references": [
        "https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69264.json",
        "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-4j8x-x6v7-w9rq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-69264",
        "https://github.com/FlowiseAI/Flowise/commit/f4e2794f6a576b94578f2fdafbf49c2fb304626c",
        "https://github.com/FlowiseAI/Flowise/pull/6499"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-94",
          "CWE-95"
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        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69264.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-69264",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518532,
  "published_at": "2026-08-04T17:22:36.676+00:00"
}