CVE-2026-26190 is a vulnerability classified as Missing Authentication for Critical Function, affecting milvus (affected versions: < 2.5.27 and >= 2.6.0, < 2.6.10). This vulnerability is rated Critical, with a CVSS score of 9.8. Public exploit code or evidence is available for this vulnerability, but that does not confirm exploitation in the wild.
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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.
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