{"id":"CVE-2026-21726","revision":"e098dbe6b60f459bb67040bf86b3a3fe","records":[{"revision":"e098dbe6b60f459bb67040bf86b3a3fe","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-21726","aliases":[],"title":"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":"2026-04-15T19:24:31.268+00:00","modifiedAt":"2026-08-27T17:22:30.899+00:00","affected":[{"ecosystem":"Vendor product","name":"Loki","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Grafana\",\n                    \"product\": \"Loki\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"2.3.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"3.5.9\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://grafana.com/security/security-advisories/cve-2026-21726"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-21726","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-21726","identifiers":["CVE-2026-21726"]},"retained":false,"historicalAffected":[]}],"coverage":[]}