{"id":"CVE-2021-36157","aliases":["GHSA-jphm-g89m-v42p"],"url":"https://o3.security/vulnerability/CVE-2021-36157","summary":"Path traversal in Grafana Cortex","details":"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.)","published":"2021-08-03T15:15:08.667Z","modified":"2026-07-09T00:36:22.369473Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":{"score":0.01392,"percentile":0.69866,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/cortexproject/cortex","fixedVersion":null}],"fix":{"url":"https://github.com/cortexproject/cortex/pull/4375","label":"cortexproject/cortex#4375"},"references":[{"type":"ADVISORY","url":"https://grafana.com/docs/grafana/latest/release-notes/"},{"type":"FIX","url":"https://github.com/cortexproject/cortex/pull/4375"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T00:36:22.369473Z"}}