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CVE-2026-27700

Published: Feb 25, 2026

Modified: Feb 27, 2026

PUBLISHED

CVSS v3.1

8.2

HIGH

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.

Vendor	Product	Versions
honojs	hono	affected `>= 4.12.0, < 4.12.2`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

References

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

x_refsource_CONFIRM

https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7

x_refsource_MISC

https://github.com/honojs/hono/releases/tag/v4.12.2

x_refsource_MISC

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