High severity · published Sep 17, 2026
CVE-2026-45726
Omni: Reader-level users can retrieve imported cluster CA keys via ResourceService
7.6
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
High
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OM
omni · siderolabs
>= 1.3.0, < 1.6.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45726
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45726
github.com
https://github.com/siderolabs/omni/commit/25fa9e141ee00285e70210ed40d11e4e457c871d
github.com
https://github.com/siderolabs/omni/commit/a224cb020f3aaca2bc21c3e32a38eb4a37e531e8
github.com
https://github.com/siderolabs/omni/commit/b8ca100c4539ea83f0ac2e53dcd523e6e5b68111
github.com
https://github.com/siderolabs/omni/pull/2807
github.com
https://github.com/siderolabs/omni/releases/tag/v1.6.6
github.com
https://github.com/siderolabs/omni/releases/tag/v1.7.3
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