CVE-2026-21728: Tempo query limit results in unbounded memory allocation
Description
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Grafana: Enterprise Traces (GET)Grafana: TempoRed Hat: Logging Subsystem for Red Hat OpenShiftRed Hat: Multicluster Global HubRed Hat: Multicluster Global Hub 1.3.4Red Hat: Multicluster Global Hub 1.4.5Red Hat: Multicluster Global Hub 1.6.5Red Hat: Multicluster Global Hub 1.7.0Red Hat: Red Hat Advanced Cluster Management for Kubernetes 2Red Hat: Red Hat Ceph Storage 5Red Hat: Red Hat Ceph Storage 6Red Hat: Red Hat Ceph Storage 9Red Hat: Red Hat Enterprise Linux 10Red Hat: Red Hat Enterprise Linux 9Red Hat: Red Hat multicluster global hub 1.5.3Red Hat: Red Hat OpenShift distributed tracing 3
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- grafana.com/security/security-advisories/cve-2026-21728 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)