CVE-2026-26190
Prior to 2.5.27 and 2.6.10, Milvus exposes TCP port 9091 by default, which enables authentication bypasses.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 39.3%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 39.26% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-306
- Affected
- milvus/milvus
- Source
- security-advisories@github.com
EPSS moved from 4.0% on 24 September 2026 to 39.3% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- https://github.com/milvus-io/milvus/commit/92b74dd2e286006a83b4a5f07951027b32e718a9Patch
- https://github.com/milvus-io/milvus/releases/tag/v2.5.27Product, Release Notes
- https://github.com/milvus-io/milvus/releases/tag/v2.6.10Product, Release Notes
- https://github.com/milvus-io/milvus/security/advisories/GHSA-7ppg-37fh-vcr6Exploit, Mitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.