Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| langflow-ai | langflow | < 1.9.1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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ashrafzaryouh/CVE-2026-55450 ★ 0 · Oct 8, 2026
CVE-2026-55450
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Langflow < 1.9.1 - Unauthenticated File Upload http/cves/2026/CVE-2026-55450.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | langflow | < 1.9.1 | 1.9.1 | GHSA-x223-p2gf-v735 |
Advisories 1
- WID-SEC-2026-1970 Langflow: Schwachstelle ermöglicht Denial of Service und Offenlegung von Informationen BSI CERT-Bund (WID) · Jun 23, 2026