CVE-2026-21729: Vulnerability in Grafana Loki
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
AI Analysis
Technical Summary
The vulnerability identified as CVE-2026-21729 affects Grafana Loki version 3.0.0. It involves the handling of queries with large limits, which can trigger large memory allocations. This excessive memory consumption can degrade or disrupt the availability of the Loki service. The issue is categorized under CWE-770 (Allocation of Resources Without Limits or Throttling). No vendor advisory or patch information is provided, and no known exploits are reported in the wild.
Potential Impact
The primary impact is on service availability due to potential resource exhaustion caused by large memory allocations when processing queries with large limits. This can lead to denial of service conditions depending on the deployment environment and resource constraints.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider limiting query sizes or implementing resource usage controls at the deployment level to mitigate potential service disruption.
CVE-2026-21729: Vulnerability in Grafana Loki
Description
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-21729 affects Grafana Loki version 3.0.0. It involves the handling of queries with large limits, which can trigger large memory allocations. This excessive memory consumption can degrade or disrupt the availability of the Loki service. The issue is categorized under CWE-770 (Allocation of Resources Without Limits or Throttling). No vendor advisory or patch information is provided, and no known exploits are reported in the wild.
Potential Impact
The primary impact is on service availability due to potential resource exhaustion caused by large memory allocations when processing queries with large limits. This can lead to denial of service conditions depending on the deployment environment and resource constraints.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider limiting query sizes or implementing resource usage controls at the deployment level to mitigate potential service disruption.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GRAFANA
- Date Reserved
- 2026-01-05T09:26:06.215Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a588e6368715ace439dd829
Added to database: 07/16/2026, 07:55:15 UTC
Last enriched: 08/11/2026, 13:35:21 UTC
Last updated: 08/27/2026, 22:52:09 UTC
Views: 96
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