How severe is CVE-2026-33378?

CVE-2026-33378 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-33378 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33378?

CVE-2026-33378 primarily affects Grafana. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-33378?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33378 have an EU (EUVD) identifier?

Yes. CVE-2026-33378 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30144.

When was CVE-2026-33378 published?

CVE-2026-33378 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-33378

CVE-2026-33378 is a medium-severity vulnerability in Grafana with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30144
Weakness: CWE-400
Affected product: Grafana
Published: 2026-05-13
Last modified: 2026-06-17

Description

Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the impact is minimal or non-existent, as the attack can take upwards of half an hour to crash the server.

Frequently asked questions

What is CVE-2026-33378?: Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the impact is minimal or non-existent, as the attack can take upwards of half an hour to crash the server.
How severe is CVE-2026-33378?: CVE-2026-33378 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-33378 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33378?: CVE-2026-33378 primarily affects Grafana. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-33378?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33378 have an EU (EUVD) identifier?: Yes. CVE-2026-33378 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30144.
When was CVE-2026-33378 published?: CVE-2026-33378 was published on 2026-05-13 and last updated on 2026-06-17.

References

https://grafana.com/security/security-advisories/cve-2026-33378

Affected products (10)

cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:11.6.14:-:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:11.6.14:security01:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:12.2.8:-:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:12.2.8:security01:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:12.3.6:-:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:12.3.6:security01:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:12.4.3:-:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:13.0.0:*:*:*:*:*:*:*
cpe:2.3:a:grafana:grafana:13.0.1:-:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

196.188.187.85 (ipv4-addr)
167.172.93.203 (ipv4-addr)