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CVE-2026-39406— @hono/node-server has a middleware bypass via repeated slashes in serveStatic

Quick assessment

Affected
honojs node-server
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.

Node.js Adapter for Hono是Hono开源的一个用于在Node.js上运行Hono应用的适配器。 Node.js Adapter for Hono 1.19.13之前版本存在路径遍历漏洞，该漏洞源于路径处理不一致，可能导致使用重复斜杠访问受保护的静态文件，从而绕过中间件。

CVSS 5.3 · Medium EPSS 0.40% · P32
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I. Basic Information for CVE-2026-39406

Vulnerability Information
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Vulnerability Title
@hono/node-server has a middleware bypass via repeated slashes in serveStatic
Source: CVE Program / CVE List V5
Vulnerability Description
@hono/node-server allows running the Hono application on Node.js. Prior to 1.19.13, a path handling inconsistency in serveStatic allows protected static files to be accessed by using repeated slashes (//) in the request path. When route-based middleware (e.g., /admin/*) is used for authorization, the router may not match paths containing repeated slashes, while serveStatic resolves them as normalized paths. This can lead to a middleware bypass. This vulnerability is fixed in 1.19.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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
Node.js Adapter for Hono 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Node.js Adapter for Hono是Hono开源的一个用于在Node.js上运行Hono应用的适配器。 Node.js Adapter for Hono 1.19.13之前版本存在路径遍历漏洞，该漏洞源于路径处理不一致，可能导致使用重复斜杠访问受保护的静态文件，从而绕过中间件。
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)

II. Public POCs for CVE-2026-39406

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III. Intelligence Information for CVE-2026-39406

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Same Patch Batch · honojs · 2026-04-08 · 5 CVEs total

CVE-2026-39407 5.3 MEDIUM Hono has a middleware bypass via repeated slashes in serveStatic
CVE-2026-39410 4.8 MEDIUM Hono has a non-breaking space prefix bypass in cookie name handling in getCookie()
CVE-2026-39408 Hono has a path traversal in toSSG() allows writing files outside the output directory
CVE-2026-39409 Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses

IV. Related Vulnerabilities

Same product: node-server
Same vendor: honojs
Same weakness: CWE-22

V. Comments for CVE-2026-39406

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