5.3

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

Deferred
Published 23-07-2026Last modified 27-08-2026

Vulnerability summary

CVE-2026-21723 is a medium (CVSS 5.3) Uncontrolled Resource Consumption vulnerability in grafana grafana oss. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.21%
0%100%
Low · -0.11 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 4
OPENSUSE-SU-2026:11619-1OPENSUSE-SU-2026:22125-1RHSA-2026:63164RHSA-2026:63165RHSA-2026:65157SUSE-SU-2026:4585-1

Timeline

  1. 23-07-2026
    PublishedVulnerability first disclosed.
  2. 27-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

Decrease -0.11 pp

From 0.33% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Grafana1 product
  • grafana oss≥ 8.0.0, ≤ 11.0.0 | ≥ 11.0.0, ≤ 11.6.10 | ≥ 12.0.0, ≤ 12.0.9 | ≥ 12.1.0, ≤ 12.1.6 | ≥ 12.2.0, ≤ 12.2.4 | ≥ 12.3.0, ≤ 12.3.2

1 vendor · 1 product

References

1 links