Docker
CVE-2026-27734
MEDIUM
GHSA-phwh-4f42-gwf3
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
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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Vulnerability AssessmentAI
| Risk Assessment | CVSS 6.5 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker (requires authentication) could exploit this vulnerability to compromise the affected system. |
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Vendor StatusVendor
SUSE
Severity: MediumShare
External POC / Exploit Code
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