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CVE-2026-21726

nvd nist
Published: Apr 15, 2026Modified: Jun 17, 2026

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5.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploitability: 3.9 / Impact: 1.4
Source: security@grafana.com (Secondary)

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.

Affected (1)

Products: Grafana: Loki
Grafana
1 product
Loki
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Loki
Before 3.6.4

Related CWEs

CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References (1)

Source: security@grafana.com
Vendor Advisory

Timeline

No history available yet.