CVE-2026-39409

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 v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39	Patch
https://github.com/honojs/hono/releases/tag/v4.12.12	Release Notes
https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-04-08 15:16

Updated : 2026-07-24 21:10

NVD link : CVE-2026-39409

Mitre link : CVE-2026-39409

CVE.ORG link : CVE-2026-39409

JSON object : View

Products Affected

hono

hono

CWE

CWE-180

Incorrect Behavior Order: Validate Before Canonicalize

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