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Loki detected_fields query limits results in unbounded memory allocation

🗓️ 15 Jul 2026 00:00:00Reported by Grafana LabsType 
grafana
 grafana
🔗 grafana.com👁 1 Views

Loki detected_fields endpoint allocates 2*limit memory on user-supplied limit, causing OOM DoS.

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Detection
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The vulnerability of the Query Engine component of the Loki logging aggregation and storage system allows a attacker to trigger a service failure.
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Vulners
Node
grafanalokiRange<3.7.0

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15 Jul 2026 00:00Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.17.5
EPSS0.00263
SSVC
1