EUVD-2026-36100Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
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.
Articles & Coverage 2
AnalysisAI
Privilege escalation in Fission (Kubernetes-native serverless framework) prior to version 1.24.0 allows a tenant with Environment CRD write access to escape the container sandbox and reach node- or cluster-level privileges by setting unfiltered fields in spec.runtime.podSpec or spec.builder.podSpec. Because the fission-executor and fission-builder service accounts schedule pods on the tenant's behalf, attacker-controlled values for hostNetwork, hostPID, hostIPC, container privileged, and serviceAccountName are merged into pod specs without validation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Attacker must already hold Kubernetes RBAC create/update permission on the Fission Environment CRD (in any namespace where Fission's executor/builder will act), which corresponds to PR:L in the CVSS vector - a normal Fission function-developer role in a multi-tenant cluster. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are largely aligned on high severity but with important caveats. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A tenant with permission to create or update Fission Environment objects in their namespace submits an Environment whose spec.runtime.podSpec sets hostPID: true, a privileged securityContext, and serviceAccountName pointing to a higher-privileged controller account. When the fission-executor schedules the runtime pod on the tenant's behalf, the merged podspec runs privileged on a node with full host PID visibility and the borrowed ServiceAccount token, letting the attacker pivot to other tenants' workloads, read node secrets, or escalate to cluster-admin. … |
| Remediation | Vendor-released patch: upgrade Fission to 1.24.0 or later (https://github.com/fission/fission/releases/tag/v1.24.0), which introduces ValidatePodSpecSafety in pkg/apis/core/v1/podspec_safety.go to reject hostNetwork, hostPID, hostIPC, serviceAccountName/DeprecatedServiceAccount overrides, hostPath volumes, container privileged, allowPrivilegeEscalation, and dangerous capabilities (SYS_ADMIN, NET_ADMIN, SYS_PTRACE, SYS_MODULE, DAC_READ_SEARCH, DAC_OVERRIDE) via the admission webhook on both CREATE and UPDATE; see PR https://github.com/fission/fission/pull/3391 and advisory https://github.com/fission/fission/security/advisories/GHSA-gx55-f84r-v3r7. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Fission deployments and document current versions and tenant access controls. …
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