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Vulnerability details

CVE-2026-33309

langflow-ai langflow

Langflow has an Arbitrary File Write (RCE) via v2 API

CVSS 3.1
10.0Critical

Official 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.

CVSS scores

ScoreVersionSourceVector
10.0Critical 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
langflow-ai langflow >= 1.2.0, < 1.9.0 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-03-24
Last updated
2026-03-25
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

13.46%
Probability of exploitation in 30 days
96.4%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-22
    Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-73
    External Control of File Name or Path
  • CWE-94
    Improper Control of Generation of Code ('Code Injection')
  • CWE-284
    Improper Access Control