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CVE-2026-21729— Loki detected_fields query limits results in unbounded memory allocation

Quick assessment

Affected
Grafana Loki
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 loki是Grafana公司开源的一个日志聚合分析系统。 Grafana Loki v3.0.0版本至v3.7.0之前版本存在资源管理错误漏洞，该漏洞源于大量限制的查询会导致大内存分配，可能影响服务可用性。

CVSS 7.5 · High EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
Grafana Loki v3.0.0< v3.7.0 affected
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I. Basic Information for CVE-2026-21729

Vulnerability Information
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Vulnerability Title
Loki detected_fields query limits results in unbounded memory allocation
Source: CVE Program / CVE List V5
Vulnerability Description
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
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 Loki 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana loki是Grafana公司开源的一个日志聚合分析系统。 Grafana Loki v3.0.0版本至v3.7.0之前版本存在资源管理错误漏洞，该漏洞源于大量限制的查询会导致大内存分配，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 Loki v3.0.0 ~ v3.7.0 -

II. Public POCs for CVE-2026-21729

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-21729

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Vendor Advisories for CVE-2026-21729 (1)

IV. Related Vulnerabilities

Same product: Loki
Same vendor: Grafana

V. Comments for CVE-2026-21729

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