🛡️ CVE-2026-21726
🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-22 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Medium
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE CWE-22
Public Exploit ✅ No
Source NVD
Published 2026-04-15
Updated 2026-06-02
Modified 2026-05-05
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/grafana/loki/v3
loki 3.6.4

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