CVE-2026-26190
CriticalExploitedPublic exploitMilvus: Unauthenticated Access to Restful API on Metrics Port (9091) Leads to Critical System Compromise
Published Feb 11, 2026 · Updated Sep 8, 2026 · Also known as BIT-milvus-2026-26190, GHSA-7ppg-37fh-vcr6, GO-2026-4481
Key Facts
Patch immediately- CVE-2026-26190 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Milvus, github.com/milvus-io/milvus (go).
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Aug 13, 2026. Public exploit code is available.
- EPSS estimates a 4.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including github.com/milvus-io/milvus 2.5.27, github.com/milvus-io/milvus 2.6.10, Milvus 2.5.27.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
4.6%
Higher than 91.4% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-26190 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Aug 13, 2026 | n/a | Not reported |
| CIRCL KEV | Aug 13, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| MilvusMilvus | >= < 2.5.27 | 2.5.27 |
| github.com/milvus-io/milvusgo | See advisory | 2.5.27 |
Patched Releases
github.com/milvus-io/milvus
2.5.27, 2.6.10
Milvus
2.5.27, 2.6.10
Timeline
Publicly disclosed
Feb 11, 2026
Added to Industry KEV feed
Aug 13, 2026
Added to CIRCL KEV
Aug 13, 2026
Last updated
Sep 8, 2026
Weakness Type
- CWE-306 Missing Authentication for Critical Function
- CWE-749 Exposed Dangerous Method or Function
- CWE-1188 Initialization of a Resource with an Insecure Default
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26190.json
- exploitVulnCheck exploitation report
- articlehttps://github.com/milvus-io/milvus/releases/tag/v2.5.27
- articlehttps://github.com/milvus-io/milvus/releases/tag/v2.6.10
FAQ
Common Questions.
Milvus is an open-source vector database built for generative AI applications.
Affected: Milvus versions >= < 2.5.27; github.com/milvus-io/milvus (go). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Aug 13, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including github.com/milvus-io/milvus 2.5.27, github.com/milvus-io/milvus 2.6.10, Milvus 2.5.27.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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