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CVE-2026-39409— Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses

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是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.12之前版本存在安全漏洞，该漏洞源于ipRestriction函数未规范化IPv4映射的IPv6客户端地址，可能导致IPv4规则匹配失败，引发意外授权行为。

AI Predicted 7.5 Difficulty: Easy EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-39409

Vulnerability Information
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Vulnerability Title
Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序：规范化之前验证
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.12之前版本存在安全漏洞，该漏洞源于ipRestriction函数未规范化IPv4映射的IPv6客户端地址，可能导致IPv4规则匹配失败，引发意外授权行为。
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-2026-39409

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III. Intelligence Information for CVE-2026-39409

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Patches & Fixes for CVE-2026-39409 (1)

Vendor Pages for CVE-2026-39409 (1)

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-2026-39406 5.3 MEDIUM @hono/node-server 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

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-180

V. Comments for CVE-2026-39409

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