CVE-2026-27878

0.0

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

Overview

Overview

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.

Details

INFO

Published Date :

June 19, 2026, 7:02 p.m.

Last Modified :

June 19, 2026, 7:03 p.m.

Remotely Exploit :

No

Source :

GRAFANA

Impact

Affected Products

The following products are affected by CVE-2026-27878 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Grafana	tempo

: Total Affected Vendor : 1 | Products : 1

Solution

Limit TraceQL query exemplar hints to prevent excessive memory allocation and service crashes.

Configure Tempo to limit the maximum value for TraceQL exemplar hints.
Ensure TraceQL queries use reasonable exemplar hint values.
Monitor Tempo memory usage for potential spikes.
Update Tempo to the latest stable version.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-27878 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.

Denial of Service

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