Bug 2567963 (CVE-2026-88982)

Summary: CVE-2026-88982 github.com/kubeflow/pipelines: Kubeflow Pipelines: Cross-tenant data disclosure via missing namespace in execution cache keys
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Kubeflow Pipelines. The execution cache service generates cache keys without including the Kubernetes namespace, allowing cached data to be accessed across tenant boundaries. In multi-tenant environments sharing the cache service, an authenticated user with workload submission privileges can exploit this issue to access another namespace's cached outputs or inject crafted outputs into subsequent pipeline steps.
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Description OSIDB Bzimport 2026-11-05 22:42:18 UTC 
Kubeflow Pipelines enables users to build and deploy portable, scalable machine learning workflows. Prior to 2.18.0, the legacy V1/raw-Argo execution cache mutating webhook and cache-server storage path hash selected template fields without the Kubernetes namespace, use the key alone for lookups and duplicate checks, and trust the mutable pipelines.kubeflow.org/execution_cache_key annotation when publishing outputs. In multi-user deployments where tenant namespaces share the cache service, a tenant with workload-submission privileges can read another namespace's cached outputs or seed matching outputs that are substituted into a later step. Standard KFP V2 component pods bypass this cache, matching requires the selected template fields and staleness policy, and arbitrary code execution or service availability impact is not established. This issue is fixed in version 2.18.0.