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Fencer Vulns
high 7.4

CVE-2026-33376 json

Auth Proxy IPv6 whitelist bypass

published 2026-05-13 5 mo ago modified 2026-10-26 13 d ago also BIT-grafana-2026-33376 , EUVD-2026-30142

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

When using an IPv6 allow-list for the Auth Proxy feature, it defaults to /32 addresses. Addresses specifying a mask explicitly are not affected; to mitigate easily, add the desired mask (usually /128) to the addresses. Only auth proxy is affected; Okta, SAML, LDAP, etc are unaffected here.

Patch / fix

  • bitnami grafana 11.6.14, 12.2.8, 12.3.6, 12.4.3, 13.0.1
  • Grafana Grafana OSS 11.6.14+security-04, 12.2.8+security-04, 12.3.6+security-04, 12.4.3+security-02, 13.0.1+security-01
  • grafana12.4 hummingbird 1 12.4.10-0.6.hum1
  • grafana13.2 hummingbird 1 13.2.1-0.5.hum1
  • grafana13.1 hummingbird 1 13.1.6-0.1.hum1
  • grafana RHEL 9 10.2.6-23.el9_8.2
  • grafana-selinux RHEL 9 10.2.6-23.el9_8.2
  • grafana RHEL 10.2 10.2.6-28.el10_2.4
  • grafana-selinux RHEL 10.2 10.2.6-28.el10_2.4
  • grafana RHEL 9.4 E4S 9.2.10-28.el9_4

red hat advisories RHSA-2026:76795RHSA-2026:76809RHSA-2026:68821RHSA-2026:68778RHSA-2026:68767RHSA-2026:67517

  • grafana SLE Module for Package Hub 15 SP7 12.4.5-150200.3.91.1
  • uyuni-tools Multi-Linux Manager Server Extension for SLE 5.1, Multi-Linux Manager Proxy Extension for SLE 5.1 5.1.29-150700.3.26.1
  • suse-multi-linux-manager-5.1-s390x-server-image Multi-Linux Manager Server Extension for SLE 5.1 5.1.4-8.20.34
  • suse-multi-linux-manager-5.1-x86_64-server-image Multi-Linux Manager Server Extension for SLE 5.1 5.1.4-8.20.34
  • suse-multi-linux-manager-5.1-aarch64-server-image Multi-Linux Manager Server Extension for SLE 5.1 5.1.4-8.20.34
  • suse-multi-linux-manager-5.1-ppc64le-server-image Multi-Linux Manager Server Extension for SLE 5.1 5.1.4-8.20.34
  • suse-multi-linux-manager-5.1-s390x-proxy-ssh-image Multi-Linux Manager Proxy Extension for SLE 5.1 5.1.4-8.20.12
  • suse-multi-linux-manager-5.1-x86_64-proxy-ssh-image Multi-Linux Manager Proxy Extension for SLE 5.1 5.1.4-8.20.12

suse advisories SUSE-SU-2026:3718-1SUSE-SU-2026:2774-1SUSE-SU-2026:2768-1

  • grafana openSUSE Leap 16.0 11.6.14+security04-bp160.1.1
  • grafana openSUSE Tumbleweed 11.6.14+security04-1.1

opensuse advisories openSUSE-SU-2026:20940-1openSUSE-SU-2026:10932-1

  • grafana AlmaLinux 9 10.2.6-23.el9_8.2
  • grafana-selinux AlmaLinux 9 10.2.6-23.el9_8.2
  • grafana AlmaLinux 10 10.2.6-28.el10_2.4
  • grafana-selinux AlmaLinux 10 10.2.6-28.el10_2.4

almalinux advisories ALSA-2026:58982ALSA-2026:54178

  • grafana Rocky Linux 9 10.2.6-23.el9_8.2
  • grafana Rocky Linux 10 10.2.6-28.el10_2.4

rocky linux advisories RLSA-2026:58982RLSA-2026:54178

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-2026-33376 updated cvss 7.4

grafana: Grafana Auth Proxy: Unauthorized access due to incorrect IPv6 allow-list default

  • 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 1.4.9 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1786621960
    fixed: vendor fix RHSA-2026:55810
  • Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1784562060
    fixed: vendor fix RHSA-2026:42852
  • Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1784561376
    fixed: vendor fix RHSA-2026:44622
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1784906628, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1785442872
    fixed: vendor fix RHSA-2026:47149
  • Red Hat Multicluster Global Hub 1.8.2 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1785443657
    fixed: vendor fix RHSA-2026:52946
  • Red Hat Enterprise Linux AppStream (v. 9) grafana 10.2.6-23.el9_8.2, grafana-selinux 10.2.6-23.el9_8.2
    fixed: vendor fix RHSA-2026:58982
  • 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
show 7 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) grafana 9.0.9-13.el9_2
    fixed: vendor fix RHSA-2026:76809
  • 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
  • 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 grafana13.1 13.1.6-0.1.hum1, grafana13.2 13.2.1-0.5.hum1, grafana12.4 12.4.10-0.6.hum1
    fixed: vendor fix RHSA-2026:68821
  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1786621693, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1786621455, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1786621416, multicluster-globalhub/multicluster-globalhub-operator-bundle 1786623856, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1786621340 Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1784127491, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1784128029, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1784127524, multicluster-globalhub/multicluster-globalhub-operator-bundle 1784565261, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1784127173 Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1784152046, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1784151884, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1784151772, multicluster-globalhub/multicluster-globalhub-operator-bundle 1784728578, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1784152164 Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1784768332, multicluster-globalhub/multicluster-globalhub-agent-rhel9 1785775948, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1784768150, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1785773056, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1784307548, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1785773214, +3 more Red Hat Multicluster Global Hub 1.8.2 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1785763319, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1785547017, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1786067967, multicluster-globalhub/multicluster-globalhub-operator-bundle 1786372816, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1785973181 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 8 grafana, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, grafana-graphite, +8 more 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
total
Assessed
5 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
bitnami grafana
>=9.4.0, <11.6.14
>=12.0.0, <12.2.8
>=12.3.0, <12.3.6
>=12.4.0, <12.4.3
>=13.0.0, <13.0.1
11.6.14
12.2.8
12.3.6
12.4.3
13.0.1

Affected products

  • Grafana Grafana OSS

Classification

Weakness
  • CWE-1188 Initialization of a Resource with an Insecure Default

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.