CVE-2026-33375: The Grafana MSSQL data source plugin contains a logic flaw that allows a low-privileged user (Viewer) to bypas

Routine

MEDIUM 6.5UPGRADE

CVE-2026-33375 is a medium-severity flaw (CVSS 6.5) affecting grafana. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Grafana MSSQL data source plugin contains a logic flaw that allows a low-privileged user (Viewer) to bypass API restrictions and trigger a catastrophic Out-Of-Memory (OOM) memory exhaustion, crashing the host container.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-400
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): Grafana Labs · Vendor: grafana

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-26 21:17 UTCPublished CVE record published
2026-06-17 13:20 UTCUpdated Record last modified

grafana grafana UPGRADE

Affected: >= 11.6.0 and < 11.6.14 · >= 12.1.0 and < 12.1.10 · >= 12.2.0 and < 12.2.8 · >= 12.3.0 and < 12.3.6 · >= 12.4.0 and < 12.4.2

Fixed in: 11.6.14, 12.1.10, 12.2.8, 12.3.6, 12.4.2

Safe to downgrade to: a release before 11.6.0

1. Check installed version

apt-cache policy grafana || rpm -q grafana || grafana --version

2. UPGRADE to 11.6.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grafana

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grafana

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 11.6.0 (Debian / Ubuntu)

apt-cache madison grafana sudo apt install grafana=<VERSION_BEFORE_11.6.0> sudo apt-mark hold grafana

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list grafana sudo dnf downgrade grafana-<VERSION_BEFORE_11.6.0> sudo dnf versionlock add grafana

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33375?

grafana: upgrade to 11.6.14, 12.1.10, 12.2.8, 12.3.6, 12.4.2. Exact commands for each OS are on this page.

Is CVE-2026-33375 being exploited?

CVE-2026-33375 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33375 affect?

CVE-2026-33375 affects grafana. Severity is medium (CVSS 6.5). The Grafana MSSQL data source plugin contains a logic flaw that allows a low-privileged user (Viewer) to bypass API restrictions and trigger a catastrophic Out-Of-Memory (OOM) memory exhaustion, crashing the host container.

How urgent is CVE-2026-33375?

Priority 32/100. No elevated risk signals yet.

Software pages

Grafana vulnerabilities

Related CVEs

CVE-2026-21727 LOW 3.3 UPGRADE A cross-tenant isolation vulnerability was found in Grafana’s Correlations feature affecting legacy correlatio
CVE-2026-33376 HIGH 7.4 UPGRADE When using an IPv6 allow-list for the Auth Proxy feature, it defaults to /32 addresses
CVE-2026-28376 MEDIUM 6.5 UPGRADE The Grafana Live push endpoint can be exploited to cause unbounded memory allocation by sending a large or str
CVE-2026-28383 MEDIUM 6.5 UPGRADE A request to the Grafana plugin resources endpoint can cause unbounded memory allocation by reading the entire
CVE-2026-33378 MEDIUM 6.5 UPGRADE Using the $__timeGroup macro, one can achieve an OOM by overloading the server

References

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