Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Grafana Loki unaffected
Version Status Constraints
v3.0.0 affected < v3.7.0

No data.

No data.

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Vendors Products
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Loki Subscribe

Project Subscriptions

Vendors Products
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Loki Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://grafana.com/security/security-advisories/cve-2026-21729 cve-icon
History

Thu, 16 Jul 2026 05:00:00 +0000

Type Values Removed Values Added
First Time appeared Grafana
Grafana loki
Vendors & Products Grafana
Grafana loki

Thu, 16 Jul 2026 03:30:00 +0000

Type Values Removed Values Added
Description Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
Title Loki detected_fields query limits results in unbounded memory allocation
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GRAFANA

Published:

Updated: 2026-07-16T03:12:07.912Z

Reserved: 2026-01-05T09:26:06.215Z

Link: CVE-2026-21729

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-16T04:45:04Z

Weaknesses

No weakness.