{"cve":"CVE-2026-33017","nvd":{"published":"2026-03-20T05:16:15.550","modified":"2026-06-17T10:36:47.177","status":"Analyzed","description":"Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses attacker-controlled flow data (containing arbitrary Python code in node definitions) instead of the stored flow data from the database. This code is passed to exec() with zero sandboxing, resulting in unauthenticated remote code execution. This is distinct from CVE-2025-3248, which fixed /api/v1/validate/code by adding authentication. The build_public_tmp endpoint is designed to be unauthenticated (for public flows) but incorrectly accepts attacker-supplied flow data containing arbitrary executable code. This issue has been fixed in version 1.9.0.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L","score":9.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-94","CWE-95","CWE-306"],"references":["https://github.com/advisories/GHSA-rvqx-wpfh-mfx7","https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0","https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx","https://github.com/langflow-ai/langflow/releases/tag/1.8.2","https://medium.com/@aviral23/cve-2026-33017-how-i-found-an-unauthenticated-rce-in-langflow-by-reading-the-code-they-already-dc96cdce5896"],"products":["langflow:langflow"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33017","score":0.96177,"percentile":0.99878,"date":"2026-10-31"},"kev":{"cve":"CVE-2026-33017","date_added":"2026-03-25","due_date":"2026-04-08","vendor":"Langflow","product":"Langflow","known_ransomware":false},"osv":[{"id":"GHSA-vwmf-pq79-vjvx","url":"https://osv.dev/vulnerability/GHSA-vwmf-pq79-vjvx","summary":"Unauthenticated Remote Code Execution in Langflow via Public Flow Build Endpoint","modified":"2026-06-29T12:26:04.313587101Z","packages":[{"ecosystem":"PyPI","name":"langflow","purl":"pkg:pypi/langflow","ranges":["<1.9.0"],"fixed":["1.9.0"]}]},{"id":"PYSEC-2026-379","url":"https://osv.dev/vulnerability/PYSEC-2026-379","summary":"Unauthenticated Remote Code Execution in Langflow via Public Flow Build Endpoint","modified":"2026-07-13T16:15:26.964557430Z","packages":[{"ecosystem":"PyPI","name":"langflow","purl":"pkg:pypi/langflow","ranges":["<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."]}