CVE-2026-26190
Milvus Allows Unauthenticated Access to Restful API on Metrics Port (9091) Leads to Critical System Compromise
CRITICAL 9.8EPSS 4.6%
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
- milvus-io · milvus
- CVSS v3.1 GITHUB
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 4.56% chance of exploitation in the next 30 days, 92nd percentile
- Nuclei
- critical · CWE-306
- Published
- 2026-02-13
- Updated
- 2026-02-26
Proof-of-concept exploits (1)
Nuclei templates (1)
Security advisories
- milvus-io/milvus/security/advisories/GHSA-7ppg-37fh-vcr6
- milvus-io/milvus/commit/92b74dd2e286006a83b4a5f07951027b32e718a9