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.
References
| Link | Resource |
|---|---|
| https://github.com/advisories/GHSA-rvqx-wpfh-mfx7 | Third Party Advisory |
| https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0 | Patch |
| https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx | Exploit Mitigation Vendor Advisory |
| https://github.com/langflow-ai/langflow/releases/tag/1.8.2 | Release Notes |
| https://medium.com/@aviral23/cve-2026-33017-how-i-found-an-unauthenticated-rce-in-langflow-by-reading-the-code-they-already-dc96cdce5896 | Exploit Third Party Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33017 | US Government Resource |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33017 | US Government Resource |
| https://www.sysdig.com/blog/cve-2026-33017-how-attackers-compromised-langflow-ai-pipelines-in-20-hours | Press/Media Coverage |
Configurations
History
No history.
Information
Published : 2026-03-20 05:16
Updated : 2026-03-26 13:26
NVD link : CVE-2026-33017
Mitre link : CVE-2026-33017
CVE.ORG link : CVE-2026-33017
JSON object : View
Products Affected
langflow
- langflow