CVE-2026-50545 Fission Environment CRD PodSpec Injection Leading to Node Escape and Cluster Takeover
Attackers can inject malicious PodSpec fields in Fission environments to escape nodes and take over the Kubernetes cluster.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50545?
CVE-2026-50545 is a critical vulnerability in fission, published on 10 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, the Environment.spec.runtime.podSpec / spec.builder.podSpec passthrough lacked validation, and MergePodSpec propagated dangerous fields into the generated pods. This issue has been patched in version 1.24.0.
Which versions are affected by CVE-2026-50545?
3 open source packages ship an affected version, including github.com/fission/fission.
| Package | Affected | Fixed in |
|---|---|---|
github.com/fission/fission Go | All versions | 1.24.0 |
github.com/fission/fission Go | All versions | 1.24.0 |
github.com/fission/fission Go | All versions | 1.24.0 |
How do I fix CVE-2026-50545?
Upgrade github.com/fission/fission to 1.24.0 or later.
Is CVE-2026-50545 being exploited?
There is no known exploitation of CVE-2026-50545 in the wild and no public exploit code.
Sources
Also known as GHSA-wmgg-3p4h-48x7, GO-2026-5860.