CVE-2026-21726
Medium · 5.3CVSS
5.3
EPSS
0.4%
Published
Apr 15, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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