CVE-2026-27734

MEDIUM 6.5

Beszel Vulnerable to Docker API Path Traversal via Unsanitized Container ID

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	henrygd
Product	beszel
Published	Feb 27, 2026
Last Updated	Mar 2, 2026

Stay Ahead of the Next One

Get instant alerts for henrygd beszel

Be the first to know when new medium vulnerabilities affecting henrygd beszel are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

henrygd / beszel

< 0.18.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/henrygd/beszel/security/advisories/GHSA-phwh-4f42-gwf3 github.com: https://github.com/henrygd/beszel/releases/tag/v0.18.4