CVE-2026-26190

CRITICAL NUCLEI

Milvus < 2.5.27 - Unauthenticated API Access via Exposed TCP Port

Title source: llm

Exploitation Summary

CVE-2026-26190 has a Nuclei detection template available — see the Nuclei card below for the Shodan/FOFA recon queries.

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.

Nuclei Templates (1)

Milvus - Unauthenticated Metrics API Access

CRITICALVERIFIEDby WRG-11

Shodan: http.html:"404 page not found" port:"9091"

References (4)

Core 4

Core References

Vendor Advisory x_refsource_confirm

https://github.com/milvus-io/milvus/security/advisories/GHSA-7ppg-37fh-vcr6

Patch x_refsource_misc

https://github.com/milvus-io/milvus/commit/92b74dd2e286006a83b4a5f07951027b32e718a9

View Patch ZIP pw:eip

Release Notes x_refsource_misc

https://github.com/milvus-io/milvus/releases/tag/v2.5.27

Release Notes x_refsource_misc

https://github.com/milvus-io/milvus/releases/tag/v2.6.10

Scores

CVSS v3 9.8

EPSS 0.2766

EPSS Percentile 97.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact total

Details

CWE

CWE-306

Status published

Products (2)

milvus/milvus < 2.5.27

milvus-io/milvus 0 - 2.5.27Go

Published Feb 13, 2026

Tracked Since Feb 18, 2026