CVE-2026-39409
Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-180 |
| Vendor | honojs |
| Product | hono |
| Published | Apr 8, 2026 |
| Last Updated | Apr 8, 2026 |
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Affected Versions
honojs / hono
< 4.12.12