cvedb.io
CVE-2026-27700
HIGH · CVSS 8.2
EPSS exploitation probability: 0%
Published 2026-02-25T16:23:26.440 · Last modified 2026-06-17T10:27:32.397

Summary

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.

Affected products

hono — hono

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.