CVE-2026-6542: Langflow

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

IBM Langflow OSS 1.0.0 through 1.8.4 could allow any user to supply a flow_id to read transaction logs and vertex build data belonging to other users, and to delete persisted vertex build data for another user's flow.

Affected products

• Langflow Langflow: from 1.0.0, before 1.9.0 (fixed in 1.9.0)

Published 2026-04-30. Last modified 2026-06-17.