{"id":"CVE-2026-21726","revision":"43a93c69002448c9ba363fff3b5616d2","records":[{"revision":"43a93c69002448c9ba363fff3b5616d2","observedAt":"2026-10-27T06:23:31.154+00:00","statement":{"source":"nvd","id":"CVE-2026-21726","aliases":[],"title":"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}","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":"2026-04-15T20:16:34.177+00:00","modifiedAt":"2026-10-26T21:10:00.17+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security@grafana.com · Secondary","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://nvd.nist.gov/vuln/detail/CVE-2026-21726","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-22"],"productCriteria":["cpe:2.3:a:grafana:loki:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-04-15T20:16:34.177","lastModified":"2026-10-26T21:10:00.170"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-21726","identifiers":["CVE-2026-21726"]},"retained":false,"historicalAffected":[]}],"coverage":[]}