CVE-2026-47674 — Hono: IP Restriction bypasses static deny rules for non-canonical IPv6

Description (CNA)

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the ip-restriction middleware (hono/ip-restriction) compares incoming IP addresses against configured deny and allow rules using string equality after partial normalization. Non-canonical IPv6 representations of an address already listed in a static rule — such as compressed forms, explicit-zero forms, or hex-notation IPv4-mapped addresses — do not match the normalized rule entry, causing the rule to be silently skipped. This vulnerability is fixed in 4.12.21.

Affected (CNA)

Vendor / product	Versions
honojs / hono	affected < 4.12.21

CWE

CWE-185, CWE-1289

References

https://github.com/honojs/hono/security/advisories/GHSA-xrhx-7g5j-rcj5

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.