CVE-2026-21726
Loki Path Traversal - CVE-2021-36156 Bypass
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | grafana |
| Product | loki |
| Ecosystems | |
| Industries | Technology |
| Published | Apr 15, 2026 |
| Last Updated | Apr 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Grafana / Loki
2.3.0 < 3.5.9