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CVE-2026-27734— Beszel Vulnerable to Docker API Path Traversal via Unsanitized Container ID

Quick assessment

Affected
henrygd beszel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Beszel是hank个人开发者的一个轻量级服务器监控中心。 Beszel 0.18.2之前版本存在路径遍历漏洞，该漏洞源于对用户提供的容器查询参数验证不足，可能导致经过身份验证的用户遍历任意Docker API端点。

CVSS 6.5 · Medium EPSS 0.51% · P41
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I. Basic Information for CVE-2026-27734

Vulnerability Information
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Vulnerability Title
Beszel Vulnerable to Docker API Path Traversal via Unsanitized Container ID
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Beszel 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Beszel是hank个人开发者的一个轻量级服务器监控中心。 Beszel 0.18.2之前版本存在路径遍历漏洞，该漏洞源于对用户提供的容器查询参数验证不足，可能导致经过身份验证的用户遍历任意Docker API端点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
henrygd beszel < 0.18.4 -

II. Public POCs for CVE-2026-27734

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III. Intelligence Information for CVE-2026-27734

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Vendor Advisories for CVE-2026-27734 (1)

IV. Related Vulnerabilities

Same product: beszel
Same vendor: henrygd
Same weakness: CWE-22

V. Comments for CVE-2026-27734

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