What is CVE-2026-33376?

CVE-2026-33376 is a high-severity vulnerability in Grafana, classified under Initialization of a Resource with an Insecure Default. CVSS score: 7.4/10. Published 2026-05-13.

How severe is CVE-2026-33376?

High severity. CVSS v3 base score is 7.4 out of 10.

RCE in Grafana

CVE-2026-33376

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 a…

EPSS: 0.000 (5.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Grafana — versions 11.6.14, 12.2.8, 12.3.6
Grafana Oss — versions 9.4.0, 11.6.14, 12.0.0

Weakness classification (CWE)

CWE-1188 — Initialization of a Resource with an Insecure Default

References

security@grafana.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33376?: CVE-2026-33376 is a high-severity vulnerability in Grafana, classified under Initialization of a Resource with an Insecure Default. CVSS score: 7.4/10. Published 2026-05-13.
How severe is CVE-2026-33376?: High severity. CVSS v3 base score is 7.4 out of 10.