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CVE-2026-21726— Loki Path Traversal - CVE-2021-36156 Bypass

CVSS 5.3 · Medium EPSS 0.01% · P3
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I. Basic Information for CVE-2026-21726

Vulnerability Information
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Vulnerability Title
Loki Path Traversal - CVE-2021-36156 Bypass
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Grafana Loki 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana Loki是Grafana开源的一个日志聚合系统。 Grafana Loki存在安全漏洞，该漏洞源于对路径遍历序列的验证不足，可能导致攻击者通过双重编码读取Ruler API端点文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
GrafanaLoki 2.3.0 ~ 3.5.9 -

II. Public POCs for CVE-2026-21726

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III. Intelligence Information for CVE-2026-21726

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Same Patch Batch · Grafana · 2026-04-15 · 4 CVEs total

CVE-2025-411189.1 CRITICALSensitive COS `SecretKey` exposed in plaintext via configuration API due to missing type p
CVE-2026-217273.3 LOWGrafana Correlations: Cross-Tenant Data Disclosure and Permanent Deletion via Legacy org_i
CVE-2025-12141Grafana Alerting Editors can edit destination of webhooks they did not create

IV. Related Vulnerabilities

Same vendor: Grafana

V. Comments for CVE-2026-21726

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