Live › vulnerability › CVE-2026-33017
Go to dashboardLangflow's unauthenticated endpoint POST /api/v1/build_public_tmp/{flow_id}/flow accepts an attacker-supplied 'data' flow whose node code is run through exec() with no sandbox. Anyone who can reach a Langflow server with a public flow can run code on it. It is exploited in the wild and in CISA KEV (due 2026-04-08). Note: 1.8.2 was wrongly reported as patched; it is still vulnerable.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Langflow Langflow | vendor | – | – |
| langflow | pypi | <= 1.8.2 | 1.9.0 |
| langflow | vendor | < 1.8.2 | 1.8.2 |
pip show langflow or docker image inspect to get the version; anything <= 1.8.2 (or 1.9.0.dev builds) is vulnerable1.9.0 or later (pip install -U langflow>=1.9.0, or the matching Docker image)Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Posts are quoted with a link to the original. They are data to us, never instructions.
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.
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