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CVE-2026-45726— Omni: Reader-level users can retrieve imported cluster CA keys via ResourceService

Quick assessment

Affected
siderolabs omni
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.

Omni 可在裸机、虚拟机或云环境中管理 Kubernetes 集群。在版本 1.3.0 至 1.6.6 以及 1.7.3 中，导入一个独立的 Talos 集群时，会创建一个名为 的资源，其中包含该集群完整的 CA 密钥包。 中的访问控制规则允许拥有 Reader 角色的已认证用户通过 ResourceService 获取该资源（前提是执行导入的操作者尚未轮换这些密钥），从而泄露 Kubernetes、Talos 和 etcd 的 CA 私钥以及服务账户密钥。Kubernetes CA 私钥可用于为高权限身份（如

CVSS 7.6 · High EPSS 0.02% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
siderolabs omni >= 1.3.0, < 1.6.6 affected
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I. Basic Information for CVE-2026-45726

Vulnerability Information
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Vulnerability Title
Omni: Reader-level users can retrieve imported cluster CA keys via ResourceService
Source: CVE Program / CVE List V5
Vulnerability Description
Omni manages Kubernetes on bare metal, virtual machines, or in a cloud. From 1.3.0 until 1.6.6 and 1.7.3, importing a standalone Talos cluster creates an ImportedClusterSecrets resource containing the cluster's complete CA secrets bundle. The access rules in internal/backend/runtime/omni/state_access.go allow an authenticated user with the Reader role to retrieve the resource through ResourceService if the importing actor has not rotated those secrets, exposing Kubernetes, Talos, and etcd CA private keys plus the service-account key. The Kubernetes CA private key permits certificate signing for privileged identities such as system:masters and provides control of the imported cluster outside Omni's authorization boundary, including its workloads, credentials, and secrets. This issue is fixed in versions 1.6.6 and 1.7.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siderolabs omni >= 1.3.0, < 1.6.6 -

II. Public POCs for CVE-2026-45726

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III. Intelligence Information for CVE-2026-45726

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Patches & Fixes for CVE-2026-45726 (4)

Vendor Advisories for CVE-2026-45726 (1)

Vendor Pages for CVE-2026-45726 (2)

Same Patch Batch · siderolabs · 2026-09-17 · 3 CVEs total

CVE-2026-45720 7.0 HIGH Omni: TOCTOU race condition allows multiple concurrent uses of a single-use SAML session t
CVE-2026-45723 2.7 LOW Omni: Operator can traverse image-factory API paths via unsanitized `talos_version` in Cre

IV. Related Vulnerabilities

Same product: omni
Same vendor: siderolabs
Same weakness: CWE-200

V. Comments for CVE-2026-45726

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