Loki Path Traversal - CVE-2021-36156 Bypass
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.
Severity medium: primary CNA CVSS 5.3 v3.1 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-04-15T19:24:31.268Z. Updated 2026-08-27T17:22:30.899Z.