CVE-2026-42129: Path traversal in the Loki data source plugin
Published Jun 22, 2026
·Updated
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.
Affected Software
2 affected components
Grafana Loki datasource plugin
Grafana Loki Datasource
Event History
Jun 22, 2026
CVE Published
via MITRE·01:18 PM
Data Sourced
via MITRE·01:18 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·02:17 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-42129?
CVE-2026-42129 has a severity rating of high, with a score of 7.7.
2
How do I fix CVE-2026-42129?
To fix CVE-2026-42129, update the Grafana Loki datasource plugin to the latest version that addresses this vulnerability.
3
What type of vulnerability is CVE-2026-42129?
CVE-2026-42129 is a path traversal vulnerability that can lead to internal information disclosure.
4
Who is affected by CVE-2026-42129?
Authenticated Viewer-role users of the Grafana Loki datasource plugin are affected by CVE-2026-42129.
5
What can attackers achieve with CVE-2026-42129?
Attackers can exploit CVE-2026-42129 to escape the resource sandbox and access sensitive administrative Loki endpoints.