medium5.3
CVE-2026-39409
Hono is a Web application framework that provides support for any JavaScript runtime.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | hono | < 4.12.12 | 4.12.12 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Hono | Hono | through 4.12.11 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-xpcf-pg52-r92g
- https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
- https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
- https://github.com/honojs/hono/releases/tag/v4.12.12
- https://nvd.nist.gov/vuln/detail/CVE-2026-39409