What’s Vulnerable › Vulnerabilities
CVE-2026-21729: Loki detected_fields query limits results in unbounded memory allocation
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-16 · updated 2026-10-24
- Weakness: CWE-770
Description
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
Affected products
- Grafana Loki: from v3.0.0 before v3.7.0 — fixed in v3.7.0
How to fix
Upgrade to a fixed version: Grafana Loki v3.7.0. Check the vendor advisory for mitigations.
References
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