by Kastro
Paper/Archive/CVE-2026-50566

CVE-2026-50566

fission fission — Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows privileged pod creation

EPSS 0.3%CVSS 9.9
critical.is priorityof 100
34
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 21.6.216 × 204.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
fission< 1.24.0–CNA

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/fission/fission/security/advisories/GHSA-m63v-2g9w-2w6vrefgithub.com/fission/fission/pull/3406refgithub.com/fission/fission/releases/tag/v1.24.0