CVE-2026-21726

medium

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.

References

https://grafana.com/security/security-advisories/cve-2026-21726

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-23100

Details

Source: Mitre, NVD

Published: 2026-04-15

Updated: 2026-04-20

Named Vulnerability: GO-2026-5115Named Vulnerability: GHSA-497x-rrr9-68jp

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Severity: Medium

EPSS

EPSS: 0.00009