CVE-2026-21728

Fixed in a distro release EPSS <1%CVSS 7.5

Tempo queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy. Mitigation can be done by setting max_result_limit in the search config, e.g. to 262144 (2^18). Alternatively, automatically restart the service.

Published 2026-04-24 · CVE record · OSV

Products: Grafana Tempo, Grafana Enterprise Traces (GET), Red Hat Multicluster Global Hub 1.3.4, Red Hat Multicluster Global Hub 1.4.5, Red Hat Multicluster Global Hub 1.6.5, Red Hat Multicluster Global Hub 1.7.0, Red Hat multicluster global hub 1.5.3, Logging Subsystem for Red Hat OpenShift, Red Hat Multicluster Global Hub, Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat Ceph Storage 5, Red Hat Ceph Storage 6, Red Hat Ceph Storage 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift distributed tracing 3

Fixed upstream

Distro releases