What is CVE-2026-21728?

CVE-2026-21728 is a high-severity vulnerability in Grafana Tempo. CVSS score: 7.5/10. Published 2026-04-24.

How severe is CVE-2026-21728?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Grafana Tempo

CVE-2026-21728

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 26…

EPSS: 0.000 (5.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Grafana Tempo — versions v1.3.0

References

grafana.com/security/security-advisories/cve-2026-21728 (vendor-advisory)

Frequently asked questions

What is CVE-2026-21728?: CVE-2026-21728 is a high-severity vulnerability in Grafana Tempo. CVSS score: 7.5/10. Published 2026-04-24.
How severe is CVE-2026-21728?: High severity. CVSS v3 base score is 7.5 out of 10.