CVE-2026-39409
Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses
- State
- Published
- Severity
- 6.3 Medium
- Published
- Apr 8, 2026
- Updated
- Apr 8, 2026
- Reserved
- Apr 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-180 Incorrect Behavior Order: Validate Before Canonicalize
Affected Products
| Product | Versions |
|---|---|
honohonojs |
|
References
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.