CVE-2026-50545: Fission Environment CRD PodSpec Injection Leading to Node Escape and Cluster Takeover

Severity: critical (CVSS 9.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-10 · updated 2026-06-17
Weakness: CWE-269

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.

Affected products

fission: before 1.24.0

References

https://github.com/fission/fission/pull/3390
https://github.com/fission/fission/pull/3391
https://github.com/fission/fission/releases/tag/v1.24.0
https://github.com/fission/fission/security/advisories/GHSA-wmgg-3p4h-48x7

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