CVE-2026-27700

HIGH

8.2

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.

CVE Details

CVSS v3.1 Score8.2

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/25/2026

Last Modified3/2/2026

Sourcenvd

Honeypot Sightings0

Affected Products

hono:hono

Weaknesses (CWE)

CWE-290CWE-345CWE-290

References

https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7(security-advisories@github.com)

https://github.com/honojs/hono/releases/tag/v4.12.2(security-advisories@github.com)

https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3(security-advisories@github.com)

IOC Correlations

No correlations recorded

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