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CVE-2026-10840 Red Hat CVE debrief

A flaw was found in the OpenShift Pipelines operator. The tekton-scheduler-rolebinding ClusterRoleBinding grants the system:authenticated group write access to Kueue and cert-manager custom resources via the tekton-scheduler-role ClusterRole. When Kueue or cert-manager CRDs are present on the cluster, any authenticated user can disrupt workload scheduling, tamper with scheduling priorities, delete other tenants' Workload objects, or induce cert-manager to overwrite TLS Secrets including the default ingress controller certificate.

Vendor
Red Hat
Product
Builds for Red Hat OpenShift
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-09-06
Advisory published
2026-06-04
Advisory updated
2026-09-06

Who should care

Users of OpenShift Pipelines operator, particularly those with Kueue or cert-manager CRDs present on their clusters.

Technical summary

The OpenShift Pipelines operator has a flaw in the tekton-scheduler-rolebinding ClusterRoleBinding, which grants write access to Kueue and cert-manager custom resources to the system:authenticated group. This allows any authenticated user to disrupt workload scheduling, tamper with scheduling priorities, delete other tenants' Workload objects, or induce cert-manager to overwrite TLS Secrets.

Defensive priority

HIGH

Recommended defensive actions

  • Review and restrict the permissions granted to the system:authenticated group.
  • Ensure that Kueue and cert-manager CRDs are not present on the cluster or restrict access to them.
  • Monitor for suspicious activity related to workload scheduling and cert-manager.

Evidence notes

The CVE-2026-10840 record was obtained from the NVD database, which lists the CVSS score as 7.1 and the severity as HIGH.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-10840 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-10840

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-10840 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-10840

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.