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CVE-2026-27878— Tempo TraceQL query with exemplar hint could result in unbounded memory usage

Quick assessment

Affected
Grafana Enterprise Traces (GET)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grafana tempo是Grafana公司开源的一个分布式追踪后端服务。 Grafana Tempo 2.8.8之前版本和Grafana Tempo 2.10.2之前版本存在安全漏洞，该漏洞源于TraceQL查询中大量exemplars hint值导致内存分配过多，可能允许已认证用户触发拒绝服务攻击。

CVSS 6.5 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
Grafana Enterprise Traces (GET) 2.6.1< 2.8.8 affected
Grafana Tempo 2.6.0< 2.10.2 affected
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I. Basic Information for CVE-2026-27878

Vulnerability Information
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Vulnerability Title
Tempo TraceQL query with exemplar hint could result in unbounded memory usage
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Grafana Tempo 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana tempo是Grafana公司开源的一个分布式追踪后端服务。 Grafana Tempo 2.8.8之前版本和Grafana Tempo 2.10.2之前版本存在安全漏洞，该漏洞源于TraceQL查询中大量exemplars hint值导致内存分配过多，可能允许已认证用户触发拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Grafana Enterprise Traces (GET) 2.6.1 ~ 2.8.8 -
Grafana Tempo 2.6.0 ~ 2.10.2 -

II. Public POCs for CVE-2026-27878

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III. Intelligence Information for CVE-2026-27878

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Vendor Advisories for CVE-2026-27878 (1)

IV. Related Vulnerabilities

Same vendor: Grafana

V. Comments for CVE-2026-27878

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