CVE-2026-24398 MEDIUM

CVE-2026-24398: Hono's IPv4 address validation bypass in IP Restriction Middleware allows IP spoofing

Vendor Honojs
Product hono
Weakness CWE-185
Published January 27, 2026
Last update January 27, 2026
View on NVD All CVEs

CVSS base score

4.8/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.11.7, IP Restriction Middleware in Hono is vulnerable to an IP address validation bypass. The `IPV4_REGEX` pattern and `convertIPv4ToBinary` function in `src/utils/ipaddr.ts` do not properly validate that IPv4 octet values are within the valid range of 0-255, allowing attackers to craft malformed IP addresses that bypass IP-based access controls. Version 4.11.7 contains a patch for the issue.

Key dates

02Disclosure timeline

January 27, 2026 CVE published
January 27, 2026 Record updated