CVE-2026-27734
MEDIUM
GHSA-phwh-4f42-gwf3
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
4Description
Beszel is a server monitoring platform. Prior to version 0.18.2, the hub's authenticated API endpoints GET /api/beszel/containers/logs and GET /api/beszel/containers/info pass the user-supplied "container" query parameter to the agent without validation. The agent constructs Docker Engine API URLs using fmt.Sprintf with the raw value instead of url.PathEscape(). Since Go's http.Client does not sanitize `../` sequences from URL paths sent over unix sockets, an authenticated user (including readonly role) can traverse to arbitrary Docker API endpoints on agent hosts, exposing sensitive infrastructure details. Version 0.18.4 fixes the issue.
Analysis
Path traversal in Beszel hub's container API endpoints allows authenticated users, including those with read-only roles, to bypass validation and access arbitrary Docker Engine API endpoints on agent hosts through improper URL path construction. This exposure of sensitive infrastructure details affects Beszel versions prior to 0.18.4 and Docker integrations, with public exploit code already available. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review file handling controls.
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External POC / Exploit Code
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