# CVE-2026-21723: CVE-2026-21723 Record

> CVE-2026-21723: CVE-2026-21723 Record. CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-21723
Last updated: 2026-10-24T13:10:00Z

- Published: 2026-07-23 01:48 UTC · Updated: 2026-10-24 13:10 UTC · Assigner: GRAFANA
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.22%, 12th percentile (scored 2026-10-25)
- CISA KEV: no

## 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.

## Affected vendors and products

- Grafana: Grafana OSS

## Tracked companies

- [Grafana Cloud](https://rewindex.com/company/grafana-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-21723)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-21723)
- [https://grafana.com/security/security-advisories/cve-2026-21723](https://grafana.com/security/security-advisories/cve-2026-21723)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-21723 · Markdown: https://rewindex.com/cve/CVE-2026-21723.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-21723 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:23.838Z