CVE-2026-39409
MEDIUMHono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
X_Refsource_Misc x_refsource_misc
https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
X_Refsource_Misc x_refsource_misc
https://github.com/honojs/hono/releases/tag/v4.12.12
Scores
CVSS v3
5.3
EPSS
0.0034
EPSS Percentile
25.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-180
Status
published
Products (3)
hono/hono
< 4.12.11
honojs/hono
< 4.12.12
npm/hono
0 - 4.12.12npm
Published
Apr 08, 2026
Tracked Since
Apr 08, 2026