GHSA-497x-rrr9-68jp

    Dashboard / Vulnerabilities / GHSA-497x-rrr9-68jp

    GHSA-497x-rrr9-68jp

    Published: 15 Apr 2026Last Modified: 10 Sept 2026

    Summary: Grafana Loki Path Traversal - CVE-2021-36156 Bypass

    Details: 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://nvd.nist.gov/vuln/detail/CVE-2026-21726, https://github.com/grafana/loki, https://grafana.com/security/security-advisories/cve-2026-21726

    Affected packages

    Package

    Name: github.com/grafana/loki/v3

    Purl: pkg:golang/github.com/grafana/loki/v3

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -3.6.4

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-497x-rrr9-68jp | CVE-DB