Medium severity · published Jan 27, 2026
CVE-2026-24398
Hono's IPv4 address validation bypass in IP Restriction Middleware allows IP spoofing
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HO
hono · honojs
< 4.11.7 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-24398
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-24398
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
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