CVE-2026-27700
HIGH
GHSA-xh87-mx6m-69f3
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Lifecycle Timeline
3Description
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.
Analysis
Hono is a Web application framework that provides support for any JavaScript runtime. [CVSS 8.2 HIGH]
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Remediation
Within 24 hours: Identify all systems and applications using Hono framework and assess exposure in production environments. Within 7 days: Apply available vendor patch to all affected Hono instances and test in staging environment. …
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External POC / Exploit Code
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