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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.

PUBLISHED Reserved 2026-01-05 | Published 2026-04-15 | Updated 2026-05-13 | Assigner GRAFANA




MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Product status

Default status
unaffected

2.3.0 (semver) before 3.5.9
affected

References

grafana.com/security/security-advisories/cve-2026-21726 vendor-advisory

cve.org (CVE-2026-21726)

nvd.nist.gov (CVE-2026-21726)

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