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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS

• CVE-2026-88982: 0.15% estimated exploitation activity in the next 30 days; percentile 4.20 (FIRST EPSS, 2026-11-10). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The legacy Kubeflow Pipelines V1/raw-Argo execution cache does not separate cached results by Kubernetes namespace. In multi-user deployments where tenants share the cache service, a tenant can receive another tenant's cached outputs or seed outputs that are subsequently substituted into another tenant's step. This affects the Argo-template cache mutating webhook and its cache-server storage path. Standard KFP V2 component pods bypass this webhook cache; the separate V2 cache implementation is outside this advisory's scope.

Affected deployments and impact The issue requires multiple tenant namespaces sharing the legacy cache service, cache-enabled V1/raw-Argo steps, and cache entries that satisfy the configured staleness policy. The standard multi-user configuration watches pods across namespaces. A tenant able to submit a step with the same cache-relevant template fields as another tenant's step can: - Read cached step outputs originally produced in another namespace.…

Published by the source

9 Nov 2026, 22:43 UTC

Last modified by the source

9 Nov 2026, 23:00 UTC

Source last checked

10 Nov 2026, 06:35 UTC

1. Revision 2 · amended · 10 Nov 2026

   Amended from osv record GHSA-2xwh-426q-42c5

2. Revision 1 · created · 9 Nov 2026

   Published from ghsa record GHSA-2xwh-426q-42c5

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# Patch Next advisory brief: CVE-2026-88982

Advisory: Kubeflow Pipelines: Cross-tenant execution-cache poisoning / output substitution via a namespace-blind cache key in the cache webhook (multi-user)
IDs: CVE-2026-88982, GHSA-2xwh-426q-42c5
Record: https://patchnext.com/advisories/cve-2026-88982 (revision 2, source checked 10 Nov 2026, 06:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/kubeflow/pipelines 0.0.0-20260910172610-620d0cc89ae0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/kubeflow/pipelines: affected < 0.0.0-20260910172610-620d0cc89ae0; fixed in 0.0.0-20260910172610-620d0cc89ae0

## Suggested inspection (read-only)
- Go github.com/kubeflow/pipelines: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/kubeflow/pipelines.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-2xwh-426q-42c5 (GitHub-reviewed advisory GHSA-2xwh-426q-42c5 lists affected ranges: Go github.com/kubeflow/pipelines >=0 <0.0.0-20260910172610-620d0cc89ae0)
- Verified: https://osv.dev/vulnerability/GHSA-2xwh-426q-42c5 (OSV record GHSA-2xwh-426q-42c5 lists affected ranges: Go github.com/kubeflow/pipelines >=0 <0.0.0-20260910172610-620d0cc89ae0 (fixed))

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