How severe is CVE-2026-42129?

CVE-2026-42129 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-42129 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42129?

CVE-2026-42129 affects Grafana Loki Datasource. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42129?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-42129 have an EU (EUVD) identifier?

Yes. CVE-2026-42129 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38241.

When was CVE-2026-42129 published?

CVE-2026-42129 was published on 2026-06-22 and last updated on 2026-07-10.

CVE-2026-42129

CVE-2026-42129 is a high-severity vulnerability in Grafana Loki Datasource with a CVSS 3.x base score of 7.7. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38241
Weakness: CWE-22
Affected product: Grafana Loki Datasource
Published: 2026-06-22
Last modified: 2026-07-10

Description

A user with Viewer permissions can use a path traversal in the Loki data source plugin to reach administrative Loki endpoints and read sensitive backend configuration and internal service information.

Frequently asked questions

What is CVE-2026-42129?: A user with Viewer permissions can use a path traversal in the Loki data source plugin to reach administrative Loki endpoints and read sensitive backend configuration and internal service information.
How severe is CVE-2026-42129?: CVE-2026-42129 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-42129 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42129?: CVE-2026-42129 affects Grafana Loki Datasource. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42129?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-42129 have an EU (EUVD) identifier?: Yes. CVE-2026-42129 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38241.
When was CVE-2026-42129 published?: CVE-2026-42129 was published on 2026-06-22 and last updated on 2026-07-10.

References

https://grafana.com/security/security-advisories/cve-2026-42129

Affected products (1)

cpe:2.3:a:grafana:loki_datasource:-:*:*:*:*:*:*:*

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