CVE-2026-27878
Received Received - Intake
Memory Exhaustion via TraceQL in Grafana Tempo

Publication date: 2026-06-19

Last updated on: 2026-06-19

Assigner: Grafana Labs

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.
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Meta Information
Published
2026-06-19
Last Modified
2026-06-19
Generated
2026-06-21
AI Q&A
2026-06-19
EPSS Evaluated
N/A
NVD
CVE-2026-27878
EUVD
EUVD-2026-38066
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
grafana tempo *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability occurs in Grafana Tempo when a TraceQL query includes a large exemplars hint value. The large value causes the Tempo instance to allocate an excessive amount of memory.

As a result, the system can run out of memory and crash.

An authenticated user can exploit this behavior to trigger a denial of service against the Tempo service.

Impact Analysis

The primary impact of this vulnerability is a denial of service (DoS) condition.

An attacker with authentication can cause the Grafana Tempo service to crash by making it consume excessive memory.

This can lead to service unavailability, disrupting monitoring and tracing capabilities that rely on Tempo.

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