CVE-2026-21726
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Apr 15, 2026
Vendor
unknown
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} Thanks to Prasanth Sundararajan for reporting this vulnerability.