Vulnerability · Published Jun 19, 2026 · Assigned by GRAFANA
CVE-2026-27878Tempo TraceQL query with exemplar hint could result in unbounded memory usage
Medium 6.5
In plain English
A medium-severity uncontrolled resource consumption in Enterprise Traces (GET) from Grafana. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 64.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/grafana/tempo | 1.5.1-0.20260303204923-b13f74291d48 | GHSA-6xff-cpcq-vpw2 |
| Go | github.com/grafana/tempo | 1.5.1-0.20260303204923-b13f74291d48 | GO-2026-6325 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Grafana | Enterprise Traces (GET) | 2.6.1 – before 2.8.8 |
| Grafana | Tempo | 2.6.0 – before 2.10.2 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- https://grafana.com/security/security-advisories/cve-2026-27878 vendor-advisory