CVE-2026-33376 | Auth Proxy IPv6 whitelist bypass

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.

Published: 2026-05-13 Last update: 2026-06-02 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-33376 is rated Low Risk (32.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.03%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-33376

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-14 — 0.03% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-33376

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.4 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 5.2 [email protected]

Weakness enumeration for CVE-2026-33376

GitHub Security Advisory for CVE-2026-33376

GHSA-3r2p-7499-27q3 · Severity: high — When using an IPv6 allow-list for the Auth Proxy feature, it defaults to /32 addresses. Addresses...

OS Trackers for CVE-2026-33376

vendor priority summary link
suse high — https://www.suse.com/security/cve/CVE-2026-33376/
ubuntu medium CVE-2026-33376 medium priority: Ubuntu including 1 source packages (grafana), 5 status rows across 5 suites (jammy, noble, questing, resolute, upstream): DNE 4, needs-triage 1. https://ubuntu.com/security/CVE-2026-33376

Affected software / configurations for CVE-2026-33376

Vendor Product Version Raw CPE
grafana grafana >= 8.5.0, < 11.6.14 cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
grafana grafana >= 12.2.0, < 12.2.8 cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
grafana grafana >= 12.3.0, < 12.3.6 cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
grafana grafana >= 12.4.0, < 12.4.3 cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
grafana grafana 11.6.14 cpe:2.3:a:grafana:grafana:11.6.14:-:*:*:*:*:*:*
grafana grafana 11.6.14 cpe:2.3:a:grafana:grafana:11.6.14:security01:*:*:*:*:*:*
grafana grafana 12.2.8 cpe:2.3:a:grafana:grafana:12.2.8:-:*:*:*:*:*:*
grafana grafana 12.2.8 cpe:2.3:a:grafana:grafana:12.2.8:security01:*:*:*:*:*:*
grafana grafana 12.3.6 cpe:2.3:a:grafana:grafana:12.3.6:-:*:*:*:*:*:*
grafana grafana 12.3.6 cpe:2.3:a:grafana:grafana:12.3.6:security01:*:*:*:*:*:*
grafana grafana 12.4.3 cpe:2.3:a:grafana:grafana:12.4.3:-:*:*:*:*:*:*
grafana grafana 13.0.0 cpe:2.3:a:grafana:grafana:13.0.0:*:*:*:*:*:*:*
grafana grafana 13.0.1 cpe:2.3:a:grafana:grafana:13.0.1:-:*:*:*:*:*:*

References for CVE-2026-33376

cvelogic Threat Intelligence