CVE-2026-39409 — Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses
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 (…
Published: 2026-04-08 · CVSS: 6.3 · CVSS 4.0
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 IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7