CVE-2026-39409 | THREATINT

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.

PUBLISHED Reserved 2026-04-07 | Published 2026-04-08 | Updated 2026-04-08 | Assigner GitHub_M

MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-180: Incorrect Behavior Order: Validate Before Canonicalize

Product status

< 4.12.12

affected

References

github.com/...s/hono/security/advisories/GHSA-xpcf-pg52-r92g

github.com/...ommit/48fa2233bc092f650119f42df043050737cabf39

github.com/honojs/hono/releases/tag/v4.12.12

cve.org (CVE-2026-39409)

nvd.nist.gov (CVE-2026-39409)

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