CVE-2026-47674

MediumCVSS 5.3/10Last modified Oct 14, 2026

Description

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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-185 CWE-1289

Affected software

Vendor	Product	Versions
honojs	hono	< 4.12.21

References

https://github.com/honojs/hono/security/advisories/GHSA-xrhx-7g5j-rcj5Vendor Advisory

Timeline

Published: May 28, 2026
Last modified: Oct 14, 2026
NVD status: Analyzed

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