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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Grafana Grafana OSS unaffected
Version Status Constraints
9.4.0 affected ≤ 11.6.14
11.6.14 affected < 11.6.14+security-04
12.0.0 affected ≤ 12.2.8
12.2.8 affected < 12.2.8+security-04
12.3.0 affected ≤ 12.3.6
12.3.6 affected < 12.3.6+security-04
12.4.0 affected ≤ 12.4.3
12.4.3 affected < 12.4.3+security-02
13.0.0 affected ≤ 13.0.1
13.0.1 affected < 13.0.1+security-01

No data.

No data.

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No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://grafana.com/security/security-advisories/cve-2026-33376 cve-icon cve-icon
History

Wed, 13 May 2026 22:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Wed, 13 May 2026 20:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Auth Proxy IPv6 whitelist bypass
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GRAFANA

Published:

Updated: 2026-05-13T19:35:08.211Z

Reserved: 2026-03-19T07:55:06.977Z

Link: CVE-2026-33376

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-13T20:16:20.367

Modified: 2026-05-13T20:16:20.367

Link: CVE-2026-33376

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T21:45:05Z

Weaknesses