Kubeflow Pipelines API server lacks authorization for shared pipeline uploads

Exploitation

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

CVSS

9.6 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS

• CVE-2026-77596: 0.25% estimated exploitation activity in the next 30 days; percentile 16.50 (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 In multi-user mode, the Kubeflow Pipelines API server's HTTP multipart upload endpoints (`POST /apis/v2beta1/pipelines/upload` and `POST /apis/v2beta1/pipelines/upload_version`) perform no authorization when the target namespace is empty. The authorization helper `canUploadVersionedPipeline` returns `nil`, skipping `SubjectAccessReview`, whenever the resolved namespace is the empty string (`backend/src/apiserver/server/pipeline_upload_server.go:401-403`). An empty namespace is how KFP addresses shared, cluster-wide pipelines and is the default whenever the caller omits the `namespace` query parameter, because `REQUIRE_NAMESPACE_FOR_PIPELINES` defaults to `false` and is unset in every shipped manifest. As a result, an arbitrary low-privilege tenant (or, when the API server is reachable, an unauthenticated caller) can create cluster-shared pipelines and inject new versions into existing shared pipelines, replacing the container image, command, and args that other tenants…

Published by the source

9 Nov 2026, 22:22 UTC

Last modified by the source

9 Nov 2026, 22:30 UTC

Source last checked

10 Nov 2026, 06:45 UTC

1. Revision 2 · amended · 10 Nov 2026

   Amended from osv record GHSA-rjr3-43j3-4q8g

2. Revision 1 · created · 9 Nov 2026

   Published from ghsa record GHSA-rjr3-43j3-4q8g

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# Patch Next advisory brief: CVE-2026-77596

Advisory: Kubeflow Pipelines API server lacks authorization for shared pipeline uploads
IDs: CVE-2026-77596, GHSA-rjr3-43j3-4q8g
Record: https://patchnext.com/advisories/cve-2026-77596 (revision 2, source checked 10 Nov 2026, 06:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.6)
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 0.0.0-20260909234119-62516d8c525f. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/kubeflow/pipelines: affected < 0.0.0-20260909234119-62516d8c525f; fixed in 0.0.0-20260909234119-62516d8c525f

## 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-rjr3-43j3-4q8g (GitHub-reviewed advisory GHSA-rjr3-43j3-4q8g lists affected ranges: Go github.com/kubeflow/pipelines >=0 <0.0.0-20260909234119-62516d8c525f)
- Verified: https://osv.dev/vulnerability/GHSA-rjr3-43j3-4q8g (OSV record GHSA-rjr3-43j3-4q8g lists affected ranges: Go github.com/kubeflow/pipelines >=0 <0.0.0-20260909234119-62516d8c525f (fixed))

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