8.2
High
CVE-2026-27700 Hono is a Web application framework that provides support for any JavaScript runtime
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| hono 4.12 | 4.12.0 → < 4.12.2 | 4.12.2 |
Other CVEs of hono
The 48 CVEs of hono →
CVE-2026-111757
Hono is a Web application framework that provides support for any JavaScript runtime
5.3
Medium
CVE-2026-109955
Hono from 4.12.4 before 4.13.11 contains a middleware bypass vulnerability in serveStatic that allows unauthenticated…
6.9
Medium
CVE-2026-93981
hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a…
2.3
Low
CVE-2026-84365
Hono is a Web application framework that provides support for any JavaScript runtime
6.5
Medium