CVE-2026-24398

low-risk
Published 2026-01-27

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.

Do I need to act?

-
0.01% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.8/10 Medium
NETWORK / HIGH complexity

Affected Products (1)

Hono

Affected Vendors

Hono

References (3)

Patch https://github.com/honojs/hono/commit/edbf6eea8e6c26a3937518d4ed91d8666edeec37
Release Notes https://github.com/honojs/hono/releases/tag/v4.11.7
Vendor Advisory https://github.com/honojs/hono/security/advisories/GHSA-r354-f388-2fhh
20
/ 100
low-risk
Severity 15/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal