Bug 2567962 (CVE-2026-88979)

Summary: CVE-2026-88979 github.com/kubeflow/pipelines: Kubeflow Pipelines: Information disclosure via default proxy signing key
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Kubeflow Pipelines. The TensorBoard proxy relies on a publicly known default secret key to sign authentication tokens. In deployments where authorization is disabled, an unauthenticated remote attacker can forge authentication tokens to query internal cluster services on port 80 and read their responses. This vulnerability leads to unauthorized information disclosure from internal network resources.
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Description OSIDB Bzimport 2026-11-05 22:42:14 UTC 
Kubeflow Pipelines enables users to build and deploy portable, scalable machine learning workflows. From 2.17.0 until 2.18.0, the TensorBoard proxy token introduced by the incomplete remediation for CVE-2026-54745 uses MINIO_SECRET_KEY as its HMAC secret, whose bundled default is publicly known. In an authorization-disabled deployment using that default, an unauthenticated attacker can forge a token containing a chosen viewerName and namespace; the proxy constructs the destination from the viewerName plus the -service suffix, the namespace, and the configured cluster domain, then reads responses on port 80 under the /tensorboard/<viewer>/ path. Resource-name validation and path-traversal rejection remain enforced, authorization-enabled deployments still check access to the selected namespace, and unrestricted metadata access, writes, or service disruption are not established. This issue is fixed in version 2.18.0.