Vulnerabilities CVE-2026-27878

CVE-2026-27878

Medium

Open

TLP:CLEAR

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

NVD CVE.org

DDoS

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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

CVSS Score: 6.5
EPSS Score ⓘ: 0.41%

33.9th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Jun 19, 2026
Last Modified: Aug 11, 2026

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