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CVE-2026-26190

Milvus authentication bypass

9.8 CRITICALPublic exploitEPSS 4.14%
  1. Published13 Feb 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Milvus≥ 2.6.0 < 2.6.10 · < 2.5.27

Remediation

Fixed in
Milvus≥ 2.6.10

References

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Frequently asked

Is CVE-2026-26190 being actively exploited?

CVE-2026-26190 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 4.14%.

How severe is CVE-2026-26190?

CVE-2026-26190 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 4.14% probability of exploitation.

Which products are affected by CVE-2026-26190?

Affected products include Milvus.

How do I fix CVE-2026-26190?

Upgrade affected software to a fixed version, for example Milvus 2.6.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26190 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.