# CVE-2026-88982: Kubeflow Pipelines: Cross-tenant execution-cache poisoning / output substitution via a namespace-blind cache key in the cache webhook (multi-user)

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- kubeflow / pipelines: < 2.18.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-345, CWE-639

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/kubeflow/pipelines/security/advisories/GHSA-2xwh-426q-42c5 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/kubeflow/pipelines/pull/14359 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/kubeflow/pipelines/commit/620d0cc89ae0d042a484a003f8ffe6e9a55d347e (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/kubeflow/pipelines/releases/tag/2.18.0 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-88982; retrieved 2026-11-05; source updated 2026-11-05

Revision: 9255d8a21982ff99aa56fcaf9ef94e15ae012ff9cee3899efe78b1be2a699ede

Canonical: https://y2.dev/cve/CVE-2026-88982

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