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CVE-2026-27700

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.2 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • hono

    Versions
    • >= 4.12.0, < 4.12.2: Affected

    No fix published

  • hono npm

    Affected ranges
    • SEMVER: ≥ 4.12.0, < 4.12.2

    Update to 4.12.2

Original sources

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