Bug 2477262 (CVE-2026-33376)

Summary:	CVE-2026-33376 grafana: Grafana Auth Proxy: Unauthorized access due to incorrect IPv6 allow-list default
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	amctagga, aoconnor, bniver, flucifre, gmeno, gparvin, groman, kyoshida, lchilton, mbenjamin, mhackett, rhaigner, rhel-process-autobot, sfeifer, sostapov, vereddy, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw in Grafana's Auth Proxy IPv6 allow-list incorrectly defaults to a broad /32 subnet mask instead of a strict /128. This misconfiguration allows remote attackers to bypass access restrictions, potentially leading to unauthorized access and data manipulation.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2501263
Bug Blocks:

Description OSIDB Bzimport 2026-05-13 20:03:14 UTC

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.

Comment 4 errata-xmlrpc 2026-08-12 06:57:33 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:54178 https://access.redhat.com/errata/RHSA-2026:54178

Comment 5 errata-xmlrpc 2026-08-24 15:06:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:58982 https://access.redhat.com/errata/RHSA-2026:58982