CVE-2026-50564 Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, node escape
Attackers can create privileged pods with host access via Fission Environment CRDs, enabling node escape and privilege escalation.
- 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-2026-50564?
CVE-2026-50564 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, Fission's Environment CRD exposes spec.runtime.podSpec and spec.builder.podSpec, which are merged into the Kubernetes pod specs for runtime and builder pods. The merge logic propagated hostNetwork, hostPID, hostIPC, container privileged, and serviceAccountName from the user-supplied podspec with no filtering, and Environment.Validate performed no security-relevant checks on these fields. This issue has been patched in version 1.24.0.
Which versions are affected by CVE-2026-50564?
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-2026-50564?
Upgrade github.com/fission/fission to 1.24.0 or later.
Is CVE-2026-50564 being exploited?
There is no known exploitation of CVE-2026-50564 in the wild and no public exploit code.
Sources
Also known as GHSA-gx55-f84r-v3r7, GO-2026-5855.