CVE-2026-26190: Milvus

Critical severity, CVSS 9.8. EPSS: 4.1% chance of exploitation in the next 30 days.

Milvus is an open-source vector database built for generative AI applications. Prior to 2.5.27 and 2.6.10, Milvus exposes TCP port 9091 by default, which enables authentication bypasses. The /expr debug endpoint uses a weak, predictable default authentication token derived from etcd.rootPath (default: by-dev), enabling arbitrary expression evaluation. The full REST API (/api/v1/*) is registered on the metrics/management port without any authentication, allowing unauthenticated access to all business operations including data manipulation and credential management. This vulnerability is fixed in 2.5.27 and 2.6.10.

Affected products

• Milvus Milvus: before 2.5.27 (fixed in 2.5.27); from 2.6.0, before 2.6.10 (fixed in 2.6.10)

Published 2026-02-13. Last modified 2026-06-17.