Vulnerability · Published Feb 13, 2026 · Assigned by GitHub_M
CVE-2026-26190Milvus Allows Unauthenticated Access to Restful API on Metrics Port (9091) Leads to Critical System Compromise
Critical 9.8
In plain English
A critical-severity missing authentication in milvus from milvus-io. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 39.3% (higher than 99% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/milvus-io/milvus | 2.5.27 | GHSA-7ppg-37fh-vcr6 |
| Go | github.com/milvus-io/milvus | 2.6.10 | GHSA-7ppg-37fh-vcr6 |
| Go | github.com/milvus-io/milvus | no fix listed | GO-2026-4481 |
Affected products (as reported)
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/milvus-io/milvus/security/advisories/GHSA-7ppg-37fh-vcr6 x_refsource_CONFIRM
- https://github.com/milvus-io/milvus/commit/92b74dd2e286006a83b4a5f07951027b32e718a9 x_refsource_MISC
- https://github.com/milvus-io/milvus/releases/tag/v2.5.27 x_refsource_MISC
- https://github.com/milvus-io/milvus/releases/tag/v2.6.10 x_refsource_MISC