7.4

CVE-2026-33376: Auth Proxy IPv6 whitelist bypass

Analyzed
AliasesUBUNTU-CVE-2026-33376CGA-2v6w-xf8x-2mgrCGA-3758-2rf5-h72p
Published 13-05-2026Last modified 27-08-2026

Vulnerability summary

CVE-2026-33376 is a high (CVSS 7.4) vulnerability in grafana. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 20.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.4 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.28%
0%100%
Low · -0.06 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 6
OPENSUSE-SU-2026:10932-1OPENSUSE-SU-2026:20940-1RHSA-2026:54178RHSA-2026:58982RHSA-2026:67517RHSA-2026:67518

Timeline

  1. 13-05-2026
    PublishedVulnerability first disclosed.
  2. 27-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

Decrease -0.06 pp

From 0.34% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard6 products
  • grafana-12.0All versions (No fix recorded)
  • grafana-12.1All versions (No fix recorded)
  • grafana-12.4< 12.4.3.02-r0
  • grafana-fips-12.0All versions (No fix recorded)
  • grafana-fips-12.1All versions (No fix recorded)
Grafana2 products
  • grafanaEOL≥ 8.5.0, < 11.6.14 | ≥ 12.2.0, < 12.2.8 | ≥ 12.3.0, < 12.3.6 | ≥ 12.4.0, < 12.4.3 | 11.6.14 | 11.6.14:security01 | 12.2.8 | 12.2.8:security01 | 12.3.6 | 12.3.6:security01 | 12.4.3 | 13.0.0 | 13.0.1
  • grafana oss≥ 9.4.0, ≤ 11.6.14 | ≥ 11.6.14, < 11.6.14+security-04 | ≥ 12.0.0, ≤ 12.2.8 | ≥ 12.2.8, < 12.2.8+security-04 | ≥ 12.3.0, ≤ 12.3.6 | ≥ 12.3.6, < 12.3.6+security-04 | ≥ 12.4.0, ≤ 12.4.3 | ≥ 12.4.3, < 12.4.3+security-02 | ≥ 13.0.0, ≤ 13.0.1 | ≥ 13.0.1, < 13.0.1+security-01
Ubuntu1 product
  • grafanaAll versions (No fix recorded)
Wolfi1 product
  • grafana-12.4< 12.4.3.02-r0

4 vendors · 10 products

References

5 links