CVE-2026-21726

Name
CVE-2026-21726
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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

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

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:grafana:loki:*:*:*:*:*:*:*:* loki >= None < 3.6.4

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
loki edge-community 3.6.3-r2 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.6.3-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.6.3-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.8-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.8-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.7-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.6-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.5-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.5-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.3-r2 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.3-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.3-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.2-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.1-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.1-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.0-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.5.0-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.4.3-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.4.2-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.4.2-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.3.2-r2 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.3.2-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.3.2-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki edge-community 3.3.0-r0 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki 3.23-community 3.5.8-r6 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki 3.23-community 3.5.8-r5 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki 3.23-community 3.5.8-r4 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki 3.23-community 3.5.8-r3 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki 3.23-community 3.5.8-r2 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable
loki 3.23-community 3.5.8-r1 Guy Godfroy <guy.godfroy@gugod.fr> possibly vulnerable