CVE-2026-27878 — Tempo TraceQL query with exemplar hint could result in unbounded memory usage
A TraceQL query in Grafana Tempo with a large exemplars hint value can cause the Tempo instance to allocate an excessive amount of memory, resulting in an out-of-memory crash. T…
Published: 2026-06-19 · CVSS: 6.5 · CVSS 3.1
A TraceQL query in Grafana Tempo with a large exemplars hint value can cause the Tempo instance to allocate an excessive amount of memory, resulting in an out-of-memory crash. This could allow an authenticated user to trigger a denial of service against the Tempo service.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7