Large Memory Allocation Vulnerability in Grafana Loki
CVE-2026-21729

7.5HIGH

Key Information:

Vendor

Grafana
Status
Loki
Vendor
CVE Published:
16 July 2026

What is CVE-2026-21729?

A vulnerability has been identified in Grafana Loki, where executing queries with excessively large limits can result in significant memory allocations. This excessive resource consumption may lead to service disruptions, depending on how the application is deployed. Users should be cautious with query parameters to avoid potential availability issues.

Affected Version(s)

Loki OnPrem v3.0.0

References

https://grafana.com/security/security-advisories/cve-2026...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.