CVE-2026-33309
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.
- Affected products
- Langflow
- Langflow
- < 1.9.0
- Fix
- Available
- CVSS 3.1
- 9.9 CRITICAL
- EPSS
- 12.4% (96th percentile)
- Weakness
- CWE-284, CWE-22, CWE-73, CWE-94
- NVD status
- Analyzed
- Published
- 2026-03-24
No indexed exploits for CVE-2026-33309 yet
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