{"id":"CVE-2021-36156","aliases":["GHSA-grj5-8x6q-hc9q"],"title":"Path traversal in Grafana Loki","summary":"Path traversal in Grafana Loki","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","vendor":"grafana","product":"github.com/grafana/loki","ecosystem":"go","affected":["github.com/grafana/loki < 2.3.0"],"patched":["github.com/grafana/loki 2.3.0"],"published":"2021-09-02","updated":"2026-08-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-grj5-8x6q-hc9q","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36156"},{"url":"https://github.com/grafana/loki/pull/4020"},{"url":"https://github.com/grafana/loki/pull/4020#issue-694377133"},{"url":"https://github.com/grafana/loki"},{"url":"https://github.com/grafana/loki/releases/tag/v2.3.0"}],"tags":["osv","go"],"epss":0.01477,"epssPercentile":0.72755,"ingestedAt":"2026-08-07T19:14:17.021Z","slug":"CVE-2021-36156","body":"## Overview\n\nAn 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.\n\n## Affected packages\n\n- `github.com/grafana/loki < 2.3.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/grafana/loki 2.3.0`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}