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CVE-2026-21726

Loki Path Traversal - CVE-2021-36156 Bypass

Published: Apr 15, 2026Updated: Jun 17, 2026 Sources: CVE List NVD BDUCWE-22
5.3MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 67.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-22

Affected Products

Grafana
oss-project·US
LokiOn-premWeb App
Enterprise Software / itsm-monitoring
Grafana Labs
commercial·US
LokiOn-premWeb App
Enterprise Software / itsm-monitoring
and 1 more affected products View all →

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://grafana.com/security/security-advisories/cve-2026-21726
grafana.com
https://grafana.com/security/security-advisories/cve-2026-21726/
grafana.com
https://www.cybersecurity-help.cz/vdb/vulns/122161/
cybersecurity-help.cz
and 1 more references View all →
News mentions
Could not load news mentions.

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