CVE-2026-10547: Langflow

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

IBM Langflow OSS 1.0.0 through 1.10.3 does not properly validate ownership in the deprecated POST /api/v1/build/{flow_id}/vertices endpoint, allowing an authenticated user to inject arbitrary graph data into a shared cache for any flow. This may result in cross-user cache pollution, unauthorized workflow execution, or denial of service.

Affected products

• Langflow Langflow: from 1.0.0, before 1.11.0 (fixed in 1.11.0)

Published 2026-08-05. Last modified 2026-08-06.