{"cve":"CVE-2026-33309","nvd":{"published":"2026-03-24T13:16:02.983","modified":"2026-06-17T10:37:17.890","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9},"cwes":["CWE-22","CWE-73","CWE-94","CWE-284"],"references":["https://github.com/langflow-ai/langflow/security/advisories/GHSA-g2j9-7rj2-gm6c"],"products":["langflow:langflow"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33309","score":0.13467,"percentile":0.96439,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-g2j9-7rj2-gm6c","url":"https://osv.dev/vulnerability/GHSA-g2j9-7rj2-gm6c","summary":"Langflow has an Arbitrary File Write (RCE) via v2 API","modified":"2026-06-06T01:00:08.146676869Z","packages":[{"ecosystem":"PyPI","name":"langflow","purl":"pkg:pypi/langflow","ranges":[">=1.2.0 <1.9.0"],"fixed":["1.9.0"]}]},{"id":"PYSEC-2026-79","url":"https://osv.dev/vulnerability/PYSEC-2026-79","summary":"","modified":"2026-05-20T09:19:04.514929Z","packages":[{"ecosystem":"PyPI","name":"langflow","purl":"pkg:pypi/langflow","ranges":[">=1.2.0 <1.9.0"],"fixed":["1.9.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}