CVE-2025-59836 Omni is Vulnerable to DoS via Empty Create/Update Resource Requests

What is CVE-2025-59836?

CVE-2025-59836 is a medium-severity vulnerability in siderolabs omni, published on 13 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-703, CWE-476

Which versions are affected by CVE-2025-59836?

5 open source packages ship an affected version, including github.com/siderolabs/omni. It affects 1 product.

Products include Siderolabs Omni.

How do I fix CVE-2025-59836?

Upgrade github.com/siderolabs/omni to a fixed version for your release line: 1.0.2 or 1.1.5.

Is CVE-2025-59836 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-59836 exists.

Other vulnerabilities in siderolabs omni

• CVE-2025-61688 Omni leaks information via the API High 8.6
• CVE-2025-59824 Omni Wireguard SideroLink potential escape Low 0.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-4p3p-cr38-v5xp, GO-2025-4021.