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CVE-2026-27700— Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo

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 4.12.0版本和4.12.1版本存在数据伪造问题漏洞，该漏洞源于在应用程序负载均衡器后使用AWS Lambda适配器时，getConnInfo()函数错误地选择X-Forwarded-For标头的第一个值，由于AWS ALB将真实客户端IP地址附加到X-Forwarded-For标头末尾，第一个值可能受攻击者控制，可能导致基于IP的访问控制机制被绕过。

CVSS 8.2 · High EPSS 0.34% · P25
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I. Basic Information for CVE-2026-27700

Vulnerability Information
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Vulnerability Title
Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header. Because AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled. This could allow IP-based access control mechanisms (such as the `ipRestriction` middleware) to be bypassed. Version 4.12.2 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 数据伪造问题漏洞
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 4.12.0版本和4.12.1版本存在数据伪造问题漏洞，该漏洞源于在应用程序负载均衡器后使用AWS Lambda适配器时，getConnInfo()函数错误地选择X-Forwarded-For标头的第一个值，由于AWS ALB将真实客户端IP地址附加到X-Forwarded-For标头末尾，第一个值可能受攻击者控制，可能导致基于IP的访问控制机制被绕过。
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 >= 4.12.0, < 4.12.2 -

II. Public POCs for CVE-2026-27700

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III. Intelligence Information for CVE-2026-27700

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Patches & Fixes for CVE-2026-27700 (1)

Vendor Advisories for CVE-2026-27700 (1)

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-345

V. Comments for CVE-2026-27700

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