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CVE-2026-47674— Hono: IP Restriction bypasses static deny rules for non-canonical IPv6

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 4.12.21之前版本存在安全漏洞，该漏洞源于ip-restriction中间件在部分规范化后使用字符串相等性比较IP地址，可能导致非规范IPv6表示形式绕过静态规则。

CVSS 5.3 · Medium EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.21 affected
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I. Basic Information for CVE-2026-47674

Vulnerability Information
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Vulnerability Title
Hono: IP Restriction bypasses static deny rules for non-canonical IPv6
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the ip-restriction middleware (hono/ip-restriction) compares incoming IP addresses against configured deny and allow rules using string equality after partial normalization. Non-canonical IPv6 representations of an address already listed in a static rule — such as compressed forms, explicit-zero forms, or hex-notation IPv4-mapped addresses — do not match the normalized rule entry, causing the rule to be silently skipped. This vulnerability is fixed in 4.12.21.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的正则表达式
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 4.12.21之前版本存在安全漏洞，该漏洞源于ip-restriction中间件在部分规范化后使用字符串相等性比较IP地址，可能导致非规范IPv6表示形式绕过静态规则。
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
honojs hono < 4.12.21 -

II. Public POCs for CVE-2026-47674

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III. Intelligence Information for CVE-2026-47674

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Vendor Advisories for CVE-2026-47674 (1)

Same Patch Batch · honojs · 2026-05-28 · 4 CVEs total

CVE-2026-47676 5.3 MEDIUM Hono: app.mount() strips mount prefix using undecoded path, causing incorrect routing for
CVE-2026-47673 4.8 MEDIUM Hono: JWT middleware accepts any Authorization scheme, not only Bearer
CVE-2026-47675 4.3 MEDIUM Hono: Cookie helper does not sanitize sameSite and priority, allowing Set-Cookie injection

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-185

V. Comments for CVE-2026-47674

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