CVE-2026-6596 langflow-ai langflow API Endpoint endpoints.py create_upload_file unrestricted upload
Attackers can upload malicious files via the API endpoint, potentially leading to code execution or privilege escalation in Langflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-6596?
CVE-2026-6596 is a medium-severity vulnerability in langflow-ai langflow, published on 20 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_file of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted upload. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-6596?
3 open source packages ship an affected version, including langflow-base.
| Package | Affected | Fixed in |
|---|---|---|
langflow-base PyPI | All versions | 0.9.1 |
langflow-base PyPI | All versions | 0.9.1 |
langflow-base PyPI | All versions | 0.9.1 |
How do I fix CVE-2026-6596?
Upgrade langflow-base to 0.9.1 or later.
Is CVE-2026-6596 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6596 exists.
Sources
Also known as ECHO-1ad9-0756-42bd, GHSA-vvfc-fp59-m92g, PYSEC-2026-2572.