CVE-2026-27878

Tempo TraceQL query with exemplar hint could result in unbounded memory usage

State: Published
Severity: 6.5 Medium
Published: Jun 19, 2026
Updated: Aug 27, 2026
Reserved: Feb 24, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	GRAFANA

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
Enterprise Traces (GET)Grafana	2.6.1 to before 2.8.8Affected
TempoGrafana	2.6.0 to before 2.10.2Affected

References

https://grafana.com/security/security-advisories/cve-2026-27878vendor-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.