Exploited vulnerability

CVE-2026-33309

TLP:CLEAR

Langflow Langflow Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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.

Facts

Vendor: Langflow
Product: Langflow
EPSS (probability of exploitation within 30 days): 13.5 %
First known exploitation: 18 October 2026
First seen by Risk Letters: 18 October 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD