CVE-2026-10547: IBM Langflow OSS cross-user cache pollution via deprecated vertices endpoint

Summary

CVE-2026-10547 affects IBM Langflow OSS versions 1.0.0 through 1.10.3. The deprecated POST /api/v1/build/{flow_id}/vertices endpoint does not properly validate ownership, letting an authenticated user inject arbitrary graph data into a shared cache for any flow. The source says this may cause cross-user cache pollution, unauthorized workflow execution, or denial of service. The NVD assessment is not yet provided, and the weakness is classified as CWE-284, Improper Access Control.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

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