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Exploitation reportedNot in CISA KEV yetFix available

CVE-2026-26190

Milvus Allows Unauthenticated Access to Restful API on Metrics Port (9091) Leads to Critical System Compromise

Exploitation reported by one source. First attested on 2026-08-13 by GCVE · kevintel.

  • Published2026-02-13
  • Fixed in2.6.10 · 2.5.27
  • WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-02-1319:17CVE publishedNVD
  2. 2026-08-1310:20Listed as exploited by GCVEGCVE
  3. 2026-08-1310:20Exploitation first reportedGCVE
  4. 2026-10-2523:12EPSS crossed 10 %FIRST EPSS

Versions per branch

NVD · OSV
Milvus
BranchAffectedFixed in
2.6≥ 2.6.0, < 2.6.102.6.10
2.5< 2.5.272.5.27

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • milvus-io milvus
    Affected
    • = < 2.5.27no fix stated
    • = >= 2.6.0, < 2.6.10no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-02-13

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • govulncheck-vulndbopenSUSE:Leap 16.0all versions · fixed in 0.0.20260723T184607-160000.1.1
  • govulncheck-vulndbopenSUSE:Leap 15.6all versions · fixed in 0.0.20260226T182644-150000.1.149.1

Full record on NVD

Fix

  1. Update Milvus to 2.6.10 · 2.5.27

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-02-13
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-7ppg-37fh-vcr6

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.

Is CVE-2026-26190 actively exploited?

A proof-of-concept exploit exists for CVE-2026-26190, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-26190?

CVE-2026-26190 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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