{"cvss":0.0,"datePublished":"2026-10-18T00:00:00Z","dateUpdated":"2026-10-18T00:00:00Z","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.","dueDate":"","id":"CVE-2026-33309","kev_catalogs":["vulncheck"],"knownRansomwareCampaignUse":"Unknown","product":"Langflow","requiredAction":"Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.","severity":"HIGH","source":"vulncheck_kev","title":"Langflow Langflow Improper Limitation of a Pathname to a Restricted Directory","vendor":"Langflow"}