CVE-2026-55446: Langflow unauthenticated DoS vulnerability in file upload

# CVE-2026-55446: Langflow unauthenticated DoS vulnerability in file upload

https://gcdradar.vercel.app/incidents/cve-2026-55446-langflow-unauthenticated-dos-vulnerability-in · AIR-2026-0779 · closed 2026-06-19

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-06-19
- AI role: Attack on AI
- Products: Langflow
- CVE ids: CVE-2026-55446
- CVSS: 7.5

## Summary

An unauthenticated remote attacker can cause a denial of service in Langflow by uploading malformed multipart form data. The application hangs or becomes unusable for all users.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-06-23: CVE-2026-55446: Langflow is a tool for building and deploying AI-powered agents and workflows. (https://nvd.nist.gov/vuln/detail/CVE-2026-55446)
- 2026-06-19: CVE-2026-55446: Langflow: Unauthenticated DoS through multipart form boundary file upload (https://github.com/advisories/GHSA-qwqc-p3q8-wcg9)

## Sources

- 2026-06-19 GitHub Advisory Database: CVE-2026-55446: Langflow: Unauthenticated DoS through multipart form boundary file upload https://github.com/advisories/GHSA-qwqc-p3q8-wcg9
- 2026-06-23 NVD: CVE-2026-55446: Langflow is a tool for building and deploying AI-powered agents and workflows. https://nvd.nist.gov/vuln/detail/CVE-2026-55446

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.