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CVE-2026-39409

Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses

Published: Apr 8, 2026Updated: Apr 21, 2026 Sources: CVE List NVDCWE-180
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 74.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-180

Affected Products

honohonojs
Library
OSS Libraries / web-framework
honohono
Library
OSS Libraries / web-framework
honojsoss-projectOSS Librariesaka hono
honooss-projectOSS Librariesaka hono js

Exploitability

Official Patch Available

References

https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
github.com
https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
github.com
https://github.com/honojs/hono/releases/tag/v4.12.12
github.com

Timeline

Published
Apr 8, 2026
Last Updated
Apr 21, 2026

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