Answer in brief
CVE-2026-21729 records a High severity (CVSS 7.5) vulnerability in Loki detected_fields query limits results in unbounded memory allocation. The current sources do not mark it as known exploited. The current feed maps Grafana/Loki (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Grafana/Loki (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Grafana/Lokigeneric | >=v3.0.0 <v3.7.0 | v3.7.0 |
Published upstream
Jul 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 16, 2026
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-21729 records a High severity (CVSS 7.5) vulnerability in Loki detected_fields query limits results in unbounded memory allocation. The current sources do not mark it as known exploited. The current feed maps Grafana/Loki (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Grafana/Loki (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Grafana/Lokigeneric | >=v3.0.0 <v3.7.0 | v3.7.0 |
Published upstream
Jul 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 16, 2026
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
Quoted source text, attributed separately from HOL analysis.