CVE-2026-42129 | Path traversal in the Loki data source plugin

A user with Viewer permissions can use a path traversal in the Loki data source plugin to reach administrative Loki endpoints and read sensitive backend configuration and internal service information.

Published: 2026-06-22 Last update: 2026-07-10 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-42129 is rated Moderate Risk (41.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.39%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-42129

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-25 0.32% 0.39% +0.08%
2 2026-06-23 — 0.32% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-42129

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.7 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.1 4.0 [email protected]

Weakness enumeration for CVE-2026-42129

GitHub Security Advisory for CVE-2026-42129

GHSA-f74p-cwhp-x2wx · Severity: high — The Loki datasource plugin's callResource handler contains a path traversal vulnerability. An...

OS Trackers for CVE-2026-42129

vendor priority summary link
ubuntu medium CVE-2026-42129 medium priority: Ubuntu has no source package entries, 0 status rows across 0 suites (none): no status rows. https://ubuntu.com/security/CVE-2026-42129

Affected software / configurations for CVE-2026-42129

Vendor Product Version Raw CPE
grafana loki_datasource — cpe:2.3:a:grafana:loki_datasource:-:*:*:*:*:*:*:*

References for CVE-2026-42129

cvelogic Threat Intelligence