Bug 2563555 (CVE-2026-118761)

Summary: CVE-2026-118761 github.com/kubeflow/pipelines: Kubeflow Pipelines: Denial of Service via unbounded archive decompression
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Kubeflow Pipelines. The API server does not properly restrict the size of decompressed data when processing uploaded archive files, performing decompression before authorization checks are completed. A remote, unauthenticated attacker could exploit this vulnerability by submitting a crafted compressed archive, causing excessive memory consumption and resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-10-29 17:40:39 UTC 
Kubeflow Pipelines enables users to build and deploy portable, scalable machine learning workflows. Prior to 2.18.0, the API server decompressed uploaded pipeline archives without adequately bounding expanded data while locating or reading the pipeline file. A small ZIP or gzip-compressed tar archive can consume disproportionately large memory and exhaust API-server resources. Multipart pipeline and pipeline-version upload processing performs decompression before namespace authorization, so a reachable caller does not need a successful pipeline-create authorization decision. URL-import handlers authorize before fetching and decompressing a remote archive. The amount of expansion required to interrupt service depends on deployment resource limits and concurrent activity, and no specific archive is guaranteed to crash every deployment. This issue is fixed in version 2.18.0.