What’s Vulnerable › Vulnerabilities

CVE-2026-26190: Milvus Allows Unauthenticated Access to Restful API on Metrics Port (9091) Leads to Critical System Compromise

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 39.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-13 · updated 2026-06-17
• Weakness: CWE-306

Description

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-io milvus: before 2.5.27; from 2.6.0 before 2.6.10 — fixed in 2.5.27, 2.6.10

How to fix

Upgrade to a fixed version: milvus-io milvus 2.5.27, 2.6.10. Check the vendor advisory for mitigations.

References

• https://github.com/milvus-io/milvus/commit/92b74dd2e286006a83b4a5f07951027b32e718a9
• https://github.com/milvus-io/milvus/releases/tag/v2.5.27
• https://github.com/milvus-io/milvus/releases/tag/v2.6.10
• https://github.com/milvus-io/milvus/security/advisories/GHSA-7ppg-37fh-vcr6

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