CVE-2026-21723 Record

Answer in brief

CVE-2026-21723 records a Unknown severity vulnerability in CVE-2026-21723 Record. 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.

Published Jul 23, 2026Updated Aug 27, 2026Source checked Sep 25, 2026First seen by HOL Aug 11, 2026Material review Aug 27, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. 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.

Affected scope and exposure questions

The current feed maps Grafana/Grafana OSS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Grafana/Grafana OSSgeneric	8.0.0 \|\| 11.0.0 \|\| 12.0.0 \|\| 12.1.0 \|\| 12.2.0 \|\| 12.3.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Grafana/Grafana OSS.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jul 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Source referencegrafana.com

Upstream source description

The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with anonymous access enabled.

Quoted source text, attributed separately from HOL analysis.