CVE-2021-36156

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-03 · updated 2026-06-17
Weakness: CWE-22

Description

An issue was discovered in Grafana Loki through 2.2.1. The header value X-Scope-OrgID is used to construct file paths for rules files, and if crafted to conduct directory traversal such as ae ../../sensitive/path/in/deployment pathname, then Loki will attempt to parse a rules file at that location and include some of the contents in the error message.

Affected products

Grafana Loki: through 2.2.1

References

https://github.com/grafana/loki/pull/4020#issue-694377133
https://github.com/grafana/loki/releases/tag/v2.3.0
https://github.com/grafana/loki/pull/4020#issue-694377133
https://github.com/grafana/loki/releases/tag/v2.3.0

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