CVE-2021-43979

Styra Open Policy Agent (OPA) Gatekeeper through 3.7.0 mishandles concurrency, sometimes resulting in incorrect access control. The data replication mechanism allows policies to access the Kubernetes cluster state. During data replication, OPA/Gatekeeper does not wait for the replication to finish before processing a request, which might cause inconsistencies between the replicated resources in OPA/Gatekeeper and the resources actually present in the cluster. Inconsistency can later be reflected in a policy bypass. NOTE: the vendor disagrees that this is a vulnerability, because Kubernetes states are only eventually consistent

• CWE-670

• https://github.com/hkerma/opa-gatekeeper-concurrency-issueThird Party Advisory
• https://github.com/open-policy-agent/gatekeeper/releasesPatch, Third Party Advisory
• https://github.com/hkerma/opa-gatekeeper-concurrency-issueThird Party Advisory
• https://github.com/open-policy-agent/gatekeeper/releasesPatch, Third Party Advisory

Published

Nov 17, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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