GHSA-x223-p2gf-v735: Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
Summary
Langflow versions before 1.9.1 allow anyone with network access to upload unlimited amounts of data to the server without logging in, which can exhaust disk space and cause the service to stop working (DoS, or denial-of-service). Additionally, the server reveals the exact file path where uploads are stored, giving attackers information that could help them chain together multiple attacks.
Solution / Mitigation
Upgrade to Langflow version 1.9.1 or later. The fix adds authentication requirements to the upload endpoint (users must log in and own the flow), enforces file size limits (returns HTTP 413 if exceeded), and only reveals file paths to authenticated flow owners.
Vulnerability Details
EPSS: 0.0%
Yes
June 17, 2026
Classification
Affected Vendors
Affected Packages
Related Issues
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Original source: https://github.com/advisories/GHSA-x223-p2gf-v735
First tracked: June 17, 2026 at 08:00 PM
Classified by LLM (prompt v3) · confidence: 95%