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CVE-2025-29781— Bare Metal Operator (BMO) can expose any secret from other namespaces via BMCEventSubscription CRD

Quick assessment

Affected
metal3-io baremetal-operator
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bare Metal Operator是Metal3开源的一个应用程序，用Kubernetes API来管理裸机主机。 Bare Metal Operator 0.8.1和0.9.1之前版本存在安全漏洞，该漏洞源于访问控制不当，可能导致秘密泄露。

CVSS 6.5 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-29781

Vulnerability Information
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Vulnerability Title
Bare Metal Operator (BMO) can expose any secret from other namespaces via BMCEventSubscription CRD
Source: CVE Program / CVE List V5
Vulnerability Description
The Bare Metal Operator (BMO) implements a Kubernetes API for managing bare metal hosts in Metal3. Baremetal Operator enables users to load Secret from arbitrary namespaces upon deployment of the namespace scoped Custom Resource `BMCEventSubscription`. Prior to versions 0.8.1 and 0.9.1, an adversary Kubernetes account with only namespace level roles (e.g. a tenant controlling a namespace) may create a `BMCEventSubscription` in his authorized namespace and then load Secrets from his unauthorized namespaces to his authorized namespace via the Baremetal Operator, causing Secret Leakage. The patch makes BMO refuse to read Secrets from other namespace than where the corresponding BMH resource is. The patch does not change the `BMCEventSubscription` API in BMO, but stricter validation will fail the request at admission time. It will also prevent the controller reading such Secrets, in case the BMCES CR has already been deployed. The issue exists for all versions of BMO, and is patched in BMO releases v0.9.1 and v0.8.1. Prior upgrading to patched BMO version, duplicate any existing Secret pointed to by `BMCEventSubscription`'s `httpHeadersRef` to the same namespace where the corresponding BMH exists. After upgrade, remove the old Secrets. As a workaround, the operator can configure BMO RBAC to be namespace scoped, instead of cluster scoped, to prevent BMO from accessing Secrets from other namespaces, and/or use `WATCH_NAMESPACE` configuration option to limit BMO to single namespace.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Bare Metal Operator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bare Metal Operator是Metal3开源的一个应用程序，用Kubernetes API来管理裸机主机。 Bare Metal Operator 0.8.1和0.9.1之前版本存在安全漏洞，该漏洞源于访问控制不当，可能导致秘密泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
metal3-io baremetal-operator = 0.9.0 -

II. Public POCs for CVE-2025-29781

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III. Intelligence Information for CVE-2025-29781

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Patches & Fixes for CVE-2025-29781 (3)

Vendor Advisories for CVE-2025-29781 (1)

Other References for CVE-2025-29781 (1)

IV. Related Vulnerabilities

Same product: baremetal-operator
Same vendor: metal3-io
Same weakness: CWE-200

V. Comments for CVE-2025-29781

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