What’s Vulnerable › Vulnerabilities
CVE-2026-27878: Tempo TraceQL query with exemplar hint could result in unbounded memory usage
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-19 · updated 2026-06-29
- Weakness: CWE-400
Description
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.
Affected products
- Grafana Tempo: from 2.6.0 before 2.8.4; from 2.9.0 before 2.9.2; from 2.10.0 before 2.10.2 — fixed in 2.10.2, 2.8.4, 2.9.2
How to fix
Upgrade to a fixed version: Grafana Tempo 2.10.2, 2.8.4, 2.9.2. Check the vendor advisory for mitigations.
References
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