CVE-2025-59836: omni Null Dereference

Description

Omni manages Kubernetes on bare metal, virtual machines, or in a cloud. Prior to 1.1.5 and 1.0.2, there is a nil pointer dereference vulnerability in the Omni Resource Service allows unauthenticated users to cause a server panic and denial of service by sending empty create/update resource requests through the API endpoints. The vulnerability exists in the isSensitiveSpec function which calls grpcomni.CreateResource without checking if the resource's metadata field is nil. When a resource is created with an empty Metadata field, the CreateResource function attempts to access resource.Metadata.Version causing a segmentation fault. This vulnerability is fixed in 1.1.5 and 1.0.2.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-476 CWE-476

CWE-703 CWE-703

Affected Products

Vendor	Product	Versions
siderolabs	omni	< 1.0.2
siderolabs	omni	1.1.0 — 1.1.5

References

Advisories & Patches

https://github.com/siderolabs/omni/commit/1396083f766a1b0380e9949968d7fc17b7afecaa https://github.com/siderolabs/omni/commit/1fd954af64985a8b3dbf5b11deddbf7cd953f5ae https://github.com/siderolabs/omni/security/advisories/GHSA-4p3p-cr38-v5xp

Exploits

https://github.com/siderolabs/omni/security/advisories/GHSA-4p3p-cr38-v5xp

Frequently Asked Questions

What is CVE-2025-59836? +

Omni manages Kubernetes on bare metal, virtual machines, or in a cloud. Prior to 1.1.5 and 1.0.2, there is a nil pointer dereference vulnerability in the Omni Resource Service allows unauthenticated users to cause a server panic and denial of service by sending empty create/update resource requests through the API endpoints. The vulnerability exists in the isSensitiveSpec function which calls grpcomni.CreateResource without checking if the resource's metadata field is nil. When a resource is created with an empty Metadata field, the CreateResource function attempts to access resource.Metadata.Version causing a segmentation fault. This vulnerability is fixed in 1.1.5 and 1.0.2. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-59836? +

CVE-2025-59836 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-59836? +

CVE-2025-59836 affects products from siderolabs, specifically: omni. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59836? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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