PYSEC-2026-2572
Langflow: DoS Through Lack of File Size Restriction via Deprecated Unauthenticated File Upload API
At a glance
- Published
- Updated
- CVE
- CVE-2026-6596
- Aliases
- GHSA-vvfc-fp59-m92g
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- CVSS_V4
- 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
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.
Affected packages
| Package | Versions |
|---|---|
| PyPI · langflow-base | introduced 0, fixed 0.9.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-6596 ADVISORY
- https://github.com/langflow-ai/langflow/commit/b5662446bc8c54d928e278d3d26ad95b62425815 WEB
- https://gist.github.com/chenhouser2025/c2aabfdee41009cfe45d28a9924742a0 WEB
- https://github.com/langflow-ai/langflow PACKAGE
- https://github.com/langflow-ai/langflow/commits/v1.9.1 WEB
- https://vuldb.com/submit/791919 WEB
- https://vuldb.com/vuln/358231 WEB
- https://vuldb.com/vuln/358231/cti WEB
- https://pypi.org/project/langflow-base PACKAGE
- https://github.com/advisories/GHSA-vvfc-fp59-m92g ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |