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CVE-2026-109955— Hono 4.12.4 before 4.13.11 Middleware Bypass via serveStatic Double Decoding

Quick assessment

Affected
honojs hono
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.

Hono 在 4.12.4 至 4.13.11 版本之前存在一个中间件绕过漏洞，该漏洞位于 模块中。攻击者可通过利用双重路径解码（double path decoding）机制，绕过前缀中间件（prefix middleware）的认证检查。具体而言，攻击者可以构造发送畸形的百分号编码路径，使得路由系统以编码形式匹配这些路径，从而在未通过身份验证检查的情况下访问静态文件。

CVSS 5.3 · Medium EPSS 0.31% · P23

Affected Version Matrix 2

VendorProduct Version RangeStatus
honojs hono 4.12.4< 4.13.11 affected
4.13.11 unaffected
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I. Basic Information for CVE-2026-109955

Vulnerability Information
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Vulnerability Title
Hono 4.12.4 before 4.13.11 Middleware Bypass via serveStatic Double Decoding
Source: CVE Program / CVE List V5
Vulnerability Description
Hono from 4.12.4 before 4.13.11 contains a middleware bypass vulnerability in serveStatic that allows unauthenticated attackers to skip prefix middleware by exploiting double path decoding. Attackers can send malformed percent-encoded paths that the router matches in encoded form, reaching static files without authentication checks running.
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
对同一数据的双重编码
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs hono 4.12.4 ~ 4.13.11 -

II. Public POCs for CVE-2026-109955

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III. Intelligence Information for CVE-2026-109955

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Vendor Advisories for CVE-2026-109955 (2)

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-174

V. Comments for CVE-2026-109955

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