{"id":"GHSA-497x-rrr9-68jp","revision":"7b74232d45db458c9a7b24898d7bc4d2","records":[{"revision":"7b74232d45db458c9a7b24898d7bc4d2","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-497x-rrr9-68jp","aliases":["CVE-2026-21726","GO-2026-5115"],"title":"Grafana Loki Path Traversal - CVE-2021-36156 Bypass","description":"The CVE-2021-36156 fix validates the namespace parameter for path traversal sequences after a single URL decode, by double encoding, an attacker can read files at the Ruler API endpoint /loki/api/v1/rules/{namespace}\n\nThanks to Prasanth Sundararajan for reporting this vulnerability.","state":0,"publishedAt":"2026-04-15T21:30:18+00:00","modifiedAt":"2026-09-10T03:51:00.9388901+00:00","affected":[{"ecosystem":"Go","name":"github.com/grafana/loki/v3","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.6.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2026-21726","https://github.com/grafana/loki","https://grafana.com/security/security-advisories/cve-2026-21726"],"sourceUrl":"https://github.com/advisories/GHSA-497x-rrr9-68jp","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-497x-rrr9-68jp","identifiers":["GHSA-497x-rrr9-68jp","CVE-2026-21726","GO-2026-5115"]},"retained":false,"historicalAffected":[]}],"coverage":[]}