CVE-2026-21728highCWE-400CWE-770

CVE-2026-21728: high-severity vulnerability in Grafana Tempo

Tempo query limit results in unbounded memory allocation

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 0.6%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Grafana · Enterprise Traces (GET)Grafana · Tempo
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