CVE-2026-50566 Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows privileged pod creation
A tenant with specific RBAC permissions can create privileged containers, leading to container escape and potential cluster compromise.
- 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-2026-50566?
CVE-2026-50566 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, a tenant with environments.fission.io create/update RBAC can run privileged / allowPrivilegeEscalation / dangerous-capability containers in the Fission function or builder namespace, scheduled under the executor's high-privilege service account — enabling container-sandbox escape, host filesystem and network access, and potential node- and cluster-level compromise. This issue has been patched in version 1.24.0.
Which versions are affected by CVE-2026-50566?
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-2026-50566?
Upgrade github.com/fission/fission to 1.24.0 or later.
Is CVE-2026-50566 being exploited?
There is no known exploitation of CVE-2026-50566 in the wild and no public exploit code.
Sources
Also known as GHSA-m63v-2g9w-2w6v, GO-2026-5857.