VULNERABILITY INTELLIGENCE

CVE-2026-21726

CVSS score5.3 MEDIUM
EPSS probability0.41%
CISA KEVNot currently listed
Published2026-04-15
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-22

Primary references