CVE-2026-50565 Fission builder pods auto-mount the fission-builder ServiceAccount token in the user-supplied builder container
Fission builder pods automatically mount privileged service account tokens into user-supplied containers, allowing attackers to escalate privileges and access cluster resources.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50565?
CVE-2026-50565 is a medium-severity vulnerability in fission, published on 10 Jun 2026. An attacker needs administrator access to exploit it, 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, Fission builder pods were created with ServiceAccountName: fission-builder and no AutomountServiceAccountToken: false, so the kubelet auto-mounted the service-account token into every container in the pod — including the user-supplied builder image. This issue has been patched in version 1.24.0.
Which versions are affected by CVE-2026-50565?
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-2026-50565?
Upgrade github.com/fission/fission to 1.24.0 or later.
Is CVE-2026-50565 being exploited?
There is no known exploitation of CVE-2026-50565 in the wild and no public exploit code.
Sources
Also known as GHSA-8wcj-mfrc-jx5q, GO-2026-5850.