CVE-2026-33309

Published Mar 24, 2026

Last updated 4 months ago

CVSS critical 9.9

API

Overview

Description: 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.
Source: security-advisories@github.com
NVD status: Analyzed
Products: langflow

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9.9
Impact score: 6
Exploitability score: 3.1
Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Severity: CRITICAL

Weaknesses

security-advisories@github.com: CWE-22

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "54961FCE-8971-4CCF-8E68-7B571195DFCD",
            "versionEndExcluding": "1.9.0",
            "versionStartIncluding": "1.2.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.

Overview

Risk scores

CVSS 3.1

Weaknesses

Social media

Configurations

Related CVEs

References