{"id":"CLEANSTART-2026-LM83943","summary":"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/ru...","details":"Security vulnerability affects the grafana package. 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} Thanks to Prasanth Sundararajan for reporting this vulnerability.","modified":"2026-10-31T16:04:20.143688871Z","published":"2026-10-31T13:30:48.646039Z","upstream":["CVE-2026-21726"],"database_specific":{},"references":[{"type":"ADVISORY","url":"https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-LM83943.json"},{"type":"WEB","url":"https://osv.dev/vulnerability/CVE-2026-21726"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21726"}],"affected":[{"package":{"name":"grafana","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/grafana"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"13.0.0-r1"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-LM83943.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}