Arbitrary file upload in Langflow-Ai Langflow
CVE-2026-6596
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (38.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Langflow-Ai Langflow — versions 1.0, 1.1.0
Weakness classification (CWE)
References
- vuldb.com/vuln/358231 (technical-description, vdb-entry)
- vuldb.com/vuln/358231/cti (signature, permissions-required)
- vuldb.com/submit/791919 (third-party-advisory)
- gist.github.com/chenhouser2025/c2aabfdee41009cfe45d28a9924742a0 (exploit)
Frequently asked questions
- What is CVE-2026-6596?
- CVE-2026-6596 is a high-severity vulnerability in Langflow-Ai Langflow, classified under Improper Access Control. CVSS score: 7.3/10. Published 2026-04-20.
- How severe is CVE-2026-6596?
- High severity. CVSS v3 base score is 7.3 out of 10.