Skip to content
Fencer Vulns
medium 5.3

CVE-2026-21723 json

CVE-2026-21723 Record

published 2026-07-23 3 mo ago modified 2026-10-24 16 d ago also BIT-grafana-2026-21723 , EUVD-2026-47869

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami grafana 11.6.11, 12.0.10, 12.1.7, 12.2.5, 12.3.3
  • grafana grafana 11.6.11, 12.0.10, 12.1.7, 12.2.5, 12.3.3
  • grafana12.4 hummingbird 1 12.4.10-0.1.hum1
  • grafana13.1 hummingbird 1 13.1.3-0.5.hum1
  • grafana13.2 hummingbird 1 13.2.1-0.1.hum1

red hat advisories RHSA-2026:65157RHSA-2026:63165RHSA-2026:63164

  • system-user-grafana SLE Module for Package Hub 15 SP7 1.0.0-150200.5.8.1
  • grafana SLE Module for Package Hub 15 SP7 12.4.10-150200.3.94.3
  • grafana Multi Linux Manager Tools SLE-15 12.4.10-150002.4.27.1
  • mgr-push Multi Linux Manager Tools SLE-15 5.2.5-150002.3.12.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.2.10-150002.3.15.1
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.2.17-150002.3.20.1
  • venv-salt-minion Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 3006.0-150002.5.22.1
  • spacewalk-client-tools Multi Linux Manager Tools SLE-15 5.2.7-150002.3.12.1

suse advisories SUSE-SU-2026:4600-1SUSE-SU-2026:4585-1

  • grafana openSUSE Leap 16.0 12.4.10-bp160.1.1
  • grafana openSUSE Tumbleweed 12.4.5-4.1

opensuse advisories openSUSE-SU-2026:22125-1openSUSE-SU-2026:11619-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-21723 updated cvss 5.3

grafana: Grafana: Denial of Service via uncontrolled memory usage in alertmanager templates

  • Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9 Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 6 rhceph/rhceph-6-dashboard-rhel9 Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9
    +4 more products
    Red Hat Ceph Storage 9 rhceph/grafana-rhel10 Red Hat Enterprise Linux 8 grafana, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, grafana-graphite, +8 more Red Hat Enterprise Linux 9 grafana, grafana-selinux Red Hat Enterprise Linux 10 grafana
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images grafana13.1 13.1.3-0.5.hum1, grafana13.2 13.2.1-0.1.hum1, grafana12.4 12.4.10-0.1.hum1
    fixed: vendor fix RHSA-2026:65157
  • Red Hat Hardened Images hi/grafana
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami grafana
>=8.0.0, <11.6.11
>=12.0.0, <12.0.10
>=12.1.0, <12.1.7
>=12.2.0, <12.2.5
>=12.3.0, <12.3.3
11.6.11
12.0.10
12.1.7
12.2.5
12.3.3

Affected products

  • Grafana Grafana OSS

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.