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CVE-2026-21728— Tempo query limit results in unbounded memory allocation

Quick assessment

Affected
Grafana Tempo
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开源的一个分布式追踪数据存储与查询系统。 Grafana Tempo存在资源管理错误漏洞，该漏洞源于查询限制过大导致大量内存分配，可能影响服务可用性。

CVSS 7.5 · High EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
Grafana Enterprise Traces (GET) 1.0.0≤ 2.8.7 affected
Grafana Tempo 1.3.0≤ 2.8.3 affected
2.9.0≤ 2.9.1 affected
2.10.0≤ 2.10.1 affected
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I. Basic Information for CVE-2026-21728

Vulnerability Information
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Vulnerability Title
Tempo query limit results in unbounded memory allocation
Source: CVE Program / CVE List V5
Vulnerability Description
Tempo queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy. Mitigation can be done by setting max_result_limit in the search config, e.g. to 262144 (2^18). Alternatively, automatically restart the service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana Tempo是Grafana开源的一个分布式追踪数据存储与查询系统。 Grafana Tempo存在资源管理错误漏洞，该漏洞源于查询限制过大导致大量内存分配，可能影响服务可用性。
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 Tempo 1.3.0 ~ 2.8.3 -
Grafana Enterprise Traces (GET) 1.0.0 ~ 2.8.7 -

II. Public POCs for CVE-2026-21728

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III. Intelligence Information for CVE-2026-21728

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IV. Related Vulnerabilities

Same product: Tempo
Same vendor: Grafana

V. Comments for CVE-2026-21728

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