{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "1.2.0"
              },
              {
                "fixed": "1.9.0"
              }
            ]
          },
          "events": [
            {
              "introduced": "0134485d5d29e384ce6be42b9deef6b64ffe8f89"
            },
            {
              "fixed": "7f3b01629629d3229550259d2a969525b2a09391"
            }
          ],
          "repo": "https://github.com/langflow-ai/langflow",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g2j9-7rj2-gm6c"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-22",
      "CWE-284",
      "CWE-73",
      "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33309.json"
  },
  "details": "Langflow is a tool for building and deploying AI-powered agents and workflows. Versions 1.2.0 through 1.8.1 have a bypass of the patch for CVE-2025-68478 (External Control of File Name), leading to the root architectural issue within `LocalStorageService` remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer `ValidatedFileName` dependency. This defense-in-depth failure leaves the `POST /api/v2/files/` endpoint vulnerable to Arbitrary File Write. The multipart upload filename bypasses the path-parameter guard, allowing authenticated attackers to write files anywhere on the host system, leading to Remote Code Execution (RCE). Version 1.9.0 contains an updated fix.",
  "id": "CVE-2026-33309",
  "modified": "2026-04-01T23:08:31.101208472Z",
  "published": "2026-03-24T12:49:16.276Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33309.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-g2j9-7rj2-gm6c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33309"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Langflow has an Arbitrary File Write (RCE) via v2 API"
}