Answer in brief
CVE-2026-8609 records a Medium severity (CVSS 5.3) vulnerability in Pre-authentication denial of service via the OAuth login route. The current sources do not mark it as known exploited. The current feed maps Grafana/Grafana OSS (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 5.3. 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/Grafana OSS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Grafana/Grafana OSSgeneric | 11.6.0 || 12.2.0 || 12.3.0 || 12.4.0 || 13.0.0 | Not reported |
Published upstream
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 10, 2026
An unauthenticated attacker can repeatedly call Grafana's OAuth login route with unique values, causing unbounded memory growth that can eventually exhaust memory and crash the Grafana instance (denial of service).
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-8609 records a Medium severity (CVSS 5.3) vulnerability in Pre-authentication denial of service via the OAuth login route. The current sources do not mark it as known exploited. The current feed maps Grafana/Grafana OSS (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 5.3. 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/Grafana OSS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Grafana/Grafana OSSgeneric | 11.6.0 || 12.2.0 || 12.3.0 || 12.4.0 || 13.0.0 | Not reported |
Published upstream
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 10, 2026
An unauthenticated attacker can repeatedly call Grafana's OAuth login route with unique values, causing unbounded memory growth that can eventually exhaust memory and crash the Grafana instance (denial of service).
Quoted source text, attributed separately from HOL analysis.