CVE-2026-27878

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

Published Jun 19, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-6xff-cpcq-vpw2 Grafana Tempo vulnerable to an out-of-memory crash
History
Type Values Removed Values Added
First Time appeared Grafana
Grafana enterprise Metrics
Grafana tempo
Vendors & Products Grafana
Grafana enterprise Metrics
Grafana tempo
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-400
Type Values Removed Values Added
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.
Title Tempo TraceQL query with exemplar hint could result in unbounded memory usage
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GRAFANA
Published
Updated
Aug 27, 2026, 5:22 PM
Reserved
Feb 24, 2026, 2:30 PM
Status
Analyzed
Published
Jun 19, 2026, 7:16 PM
Modified
Jun 29, 2026, 7:59 PM