# CVE-2026-47674

## Summary

- **CVE ID:** CVE-2026-47674
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-185, CWE-1289
- **Published:** May 28, 2026
- **Last Modified:** Jun 2, 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.

## Affected Products

- honojs — hono (< 4.12.21)

## References

- [CNA](https://github.com/honojs/hono/security/advisories/GHSA-xrhx-7g5j-rcj5)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 15.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._