How severe is CVE-2026-26190?

CVE-2026-26190 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-26190 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26190?

CVE-2026-26190 affects Milvus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26190?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-26190 have an EU (EUVD) identifier?

Yes. CVE-2026-26190 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5932.

When was CVE-2026-26190 published?

CVE-2026-26190 was published on 2026-02-13 and last updated on 2026-06-17.

CVE-2026-26190

CVE-2026-26190 is a critical-severity vulnerability in Milvus with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 28% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 28% (98th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5932
Weakness: CWE-306
Affected product: Milvus
Published: 2026-02-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-26190?: 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.
How severe is CVE-2026-26190?: CVE-2026-26190 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-26190 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26190?: CVE-2026-26190 affects Milvus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26190?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-26190 have an EU (EUVD) identifier?: Yes. CVE-2026-26190 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5932.
When was CVE-2026-26190 published?: CVE-2026-26190 was published on 2026-02-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:milvus:milvus:*:*:*:*:*:*:*:*

More vulnerabilities in Milvus

CVE-2026-10814 — Medium (CVSS 4.5): A vulnerability has been found in milvus-io milvus up to 2.6.13. This vulnerability affects unknown code of the file…

All CVEs affecting Milvus →

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities

CVE-2026-54309 — Critical (CVSS 10.0): n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, when @n8n/mcp-browser is run in HTTP…
CVE-2026-50242 — Critical (CVSS 10.0): In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429…
CVE-2026-49257 — Critical (CVSS 10.0): mcp-pinot is a Python-based Model Context Protocol (MCP) server for interacting with Apache Pinot. In versions 3.0.1…
CVE-2026-46846 — Critical (CVSS 10.0): Vulnerability in the Oracle WebCenter Portal product of Oracle Fusion Middleware (component: Security Framework).…
CVE-2026-46803 — Critical (CVSS 10.0): Vulnerability in the Oracle WebCenter Portal product of Oracle Fusion Middleware (component: Security Framework).…
CVE-2026-46800 — Critical (CVSS 10.0): Vulnerability in the Oracle WebCenter Sites product of Oracle Fusion Middleware (component: WebCenter Sites).…

Browse all CWE-306 (Missing Authentication for Critical Function) vulnerabilities →