CVE-2026-39409

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction does not canonicalize IPv4-mapped IPv6 client addresses e.g. ::ffff:127.0.0.1 before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause...

CVE-2026-39409

CVE-2026-39409 affects the Hono web application framework. The vulnerability lies in ipRestriction() not canonicalizing IPv4-mapped IPv6 addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow/deny rules, which can cause IPv4 rules to fail to match in dual-stack environments (e.g., Node.js)....

Incorrect Behavior Order: Validate Before Canonicalize

Overview hono is an Ultrafast web framework for the Edges Affected versions of this package are vulnerable to Incorrect Behavior Order: Validate Before Canonicalize in the ipRestriction function. An attacker can bypass access restrictions by sending requests from IPv4-mapped IPv6 addresses, which...

Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses

Summary ipRestriction does not canonicalize IPv4-mapped IPv6 client addresses e.g. ::ffff:127.0.0.1 before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. Details The middlewar...

Incorrect Behavior Order: Validate Before Canonicalize

Overview org.webjars.npm:hono is an Ultrafast web framework for the Edges Affected versions of this package are vulnerable to Incorrect Behavior Order: Validate Before Canonicalize in the ipRestriction function. An attacker can bypass access restrictions by sending requests from IPv4-mapped IPv6...

CVE-2026-39409: Incorrect Behavior Order: Validate Before Canonicalize

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction does not canonicalize IPv4-mapped IPv6 client addresses e.g. ::ffff:127.0.0.1 before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause...

CVE-2026-27700: Insufficient Verification of Data Authenticity

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...