VYPR
High severityNVD Advisory· Published Feb 25, 2026· Updated Feb 27, 2026

Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo

CVE-2026-27700

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
hononpm
>= 4.12.0, < 4.12.24.12.2

Affected products

4

Patches

Vulnerability mechanics

References

5

News mentions

0

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