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Fencer Vulns
high 7.5

CVE-2026-42127 json

Pre-authentication denial of service in the public dashboard query endpoint

published 2026-06-22 4 mo ago modified 2026-09-28 42 d ago also BIT-grafana-2026-42127 , EUVD-2026-38309 , GHSA-3w66-95m3-8jxg , GO-2026-6541

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

The public dashboard query endpoint does not limit request body size before processing, allowing unauthenticated attackers to trigger excessive memory allocation by sending arbitrarily large JSON payloads. This can lead to denial of service through memory exhaustion. No valid dashboard access token or authentication is required to exploit this vulnerability.

Patch / fix

  • go github.com/grafana/grafana 1.9.2-0.20260616075434-82ef13993059
  • bitnami grafana 11.6.15, 12.2.9, 12.3.7, 12.4.4, 13.0.2
  • grafana grafana 11.6.15, 12.2.9, 12.3.7, 12.4.4, 13.0.2
  • grafana13.2 hummingbird 1 13.2.1-0.5.hum1
  • grafana RHEL 8 9.2.10-32.el8_10.1
  • grafana-selinux RHEL 8 9.2.10-32.el8_10.1
  • grafana RHEL 9 10.2.6-23.el9_8.1
  • grafana-selinux RHEL 9 10.2.6-23.el9_8.1
  • grafana RHEL 10.2 10.2.6-28.el10_2.4
  • grafana-selinux RHEL 10.2 10.2.6-28.el10_2.4
  • grafana13.1 hummingbird 1 13.1.1-0.2.hum1

red hat advisories RHSA-2026:76795RHSA-2026:68778RHSA-2026:54243RHSA-2026:54184RHSA-2026:67517RHSA-2026:67518

  • 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 12.4.5-3.1

opensuse advisories openSUSE-SU-2026:22125-1openSUSE-SU-2026:11332-1

  • grafana AlmaLinux 10 10.2.6-28.el10_2.4
  • grafana-selinux AlmaLinux 10 10.2.6-28.el10_2.4
  • grafana AlmaLinux 9 10.2.6-23.el9_8.1
  • grafana-selinux AlmaLinux 9 10.2.6-23.el9_8.1
  • grafana AlmaLinux 8 9.2.10-32.el8_10.1
  • grafana-selinux AlmaLinux 8 9.2.10-32.el8_10.1

almalinux advisories ALSA-2026:54178ALSA-2026:54184ALSA-2026:54243

  • grafana Rocky Linux 9 10.2.6-23.el9_8.1
  • grafana Rocky Linux 8 9.2.10-32.el8_10.1

rocky linux advisories RLSA-2026:54184RLSA-2026:54243

  • grafana Alpine 3.24 12.4.4-r0

alpine advisories ALPINE-CVE-2026-42127

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-42127 updated cvss 7.5

grafana: Grafana: Denial of Service due to excessive memory allocation via large JSON payloads

  • 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 Red Hat Ceph Storage 9 rhceph/grafana-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1793002792
    fixed: vendor fix RHSA-2026:95517
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/acm-grafana-rhel9 1790177771
    fixed: vendor fix RHSA-2026:72885
  • Red Hat Enterprise Linux AppStream (v. 8) grafana 9.2.10-32.el8_10.1, grafana-selinux 9.2.10-32.el8_10.1
    fixed: vendor fix RHSA-2026:54243
  • Red Hat Enterprise Linux AppStream (v. 9) grafana 10.2.6-23.el9_8.1, grafana-selinux 10.2.6-23.el9_8.1
    fixed: vendor fix RHSA-2026:54184
  • Red Hat Enterprise Linux AppStream (v. 10) grafana 10.2.6-28.el10_2.4, grafana-selinux 10.2.6-28.el10_2.4
    fixed: vendor fix RHSA-2026:54178
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) grafana 9.2.10-28.el9_4, grafana-selinux 9.2.10-28.el9_4
    fixed: vendor fix RHSA-2026:76795
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) grafana 10.2.6-26.el10_0, grafana-selinux 10.2.6-26.el10_0
    fixed: vendor fix RHSA-2026:67517
show 3 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) grafana 10.2.6-23.el9_6, grafana-selinux 10.2.6-23.el9_6
    fixed: vendor fix RHSA-2026:67518
  • Red Hat Hardened Images grafana12.4 12.4.6-0.2.hum1, grafana13.1 13.1.1-0.2.hum1, grafana13.2 13.2.1-0.5.hum1
    fixed: vendor fix RHSA-2026:47619
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1792971214, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1792971204, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1793057598, multicluster-globalhub/multicluster-globalhub-operator-bundle 1793081711, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1793057536 Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/thanos-rhel9 1790178106, rhacm2/acm-cli-rhel9 1790176296, rhacm2/console-rhel9 1790177033, rhacm2/prometheus-rhel9 1790199758, rhacm2/acm-search-v2-rhel9 1790177355, rhacm2/node-exporter-rhel9 1790178391, +37 more
    not affected: vulnerable code 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
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/grafana/grafana
>=2.0.0-beta1
>=12.0.0
>=12.3.0
>=12.4.0
>=13.0.0
<1.9.2-0.20260616075434-82ef13993059
all versions
>=2.0.0-beta1+incompatible
1.9.2-0.20260616075434-82ef13993059
bitnami grafana
<11.6.15
>=12.2.0, <12.2.9
>=12.3.0, <12.3.7
>=12.4.0, <12.4.4
>=13.0.0, <12.2.9
>=13.0.0, <13.0.2
11.6.15
12.2.9
12.3.7
12.4.4
13.0.2

Affected products

  • Grafana Grafana Enterprise
  • Grafana Grafana OSS

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.