CVE-2026-27878

Analyzed Analyzed - Analysis Complete

Memory Exhaustion via TraceQL in Grafana Tempo

Publication date: 2026-06-19

Last updated on: 2026-06-29

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-19

Last Modified

2026-06-29

Generated

2026-07-11

AI Q&A

2026-06-19

EPSS Evaluated

2026-07-10

NVD

CVE-2026-27878

EUVD

EUVD-2026-38066

Affected Vendors & Products

Vendor	Product	Version / Range
grafana	tempo	From 2.10.0 (inc) to 2.10.2 (exc)
grafana	tempo	From 2.9.0 (inc) to 2.9.2 (exc)
grafana	tempo	From 2.6.0 (inc) to 2.8.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

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.

Hi! I’m here to help you understand CVE-2026-27878. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70