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CVE details

CVE-2026-21726

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.

Score
5.3 medium
Published
2026-04-15
Links
NVD · cve.org

Matched ports (1)

PortPackageVersionStatusMaintainer
sysutils/lokigrafana-loki2.9.2_34unaddressedfreebsd@funzi.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>grafana-loki</name>
	<range><lt>3.6.4</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>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.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-21726</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-21726</url>
    </references>
    <dates>
      <discovery>2026-04-15</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>