NuytsTech Security

CVE-2026-21726

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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.

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

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