CVE-2021-36157: Linuxfoundation Cortex

Medium severity, CVSS 5.3. EPSS: 1.4% chance of exploitation in the next 30 days.

An issue was discovered in Grafana Cortex through 1.9.0. 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 Cortex will attempt to parse a rules file at that location and include some of the contents in the error message. (Other Cortex API requests can also be sent a malicious OrgID header, e.g., tricking the ingester into writing metrics to a different location, but the effect is nuisance rather than information disclosure.)

Affected products

• Linuxfoundation Cortex: up to and including 1.9.0

Published 2021-08-03. Last modified 2026-06-17.