SB2026013060 - Path traversal in Grafana Loki

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Main Vulnerability Database SB2026013060

SB2026013060 - Path traversal in Grafana Loki

Published: January 30, 2026

Security Bulletin ID SB2026013060
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Path traversal (CVE-ID: CVE-2026-21726)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences within the "/loki/api/v1/rules/{namespace}" API endpoint. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Note, the vulnerability exists due to incomplete fix for #VU64412 (CVE-2021-36156).


Remediation

Install update from vendor's website.

References