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CVE-2026-47674

Hono: IP Restriction bypasses static deny rules for non-canonical IPv6

Published: May 28, 2026Updated: May 29, 2026 Sources: CVE List NVDCWE-185
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.2%
Top 84.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the ip-restriction middleware (hono/ip-restriction) compares incoming IP addresses against configured deny and allow rules using string equality after partial normalization. Non-canonical IPv6 representations of an address already listed in a static rule — such as compressed forms, explicit-zero forms, or hex-notation IPv4-mapped addresses — do not match the normalized rule entry, causing the rule to be silently skipped. This vulnerability is fixed in 4.12.21.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-185CWE-1289

Affected Products

honohonojs
Library
OSS Libraries / web-framework
honohono
Library
OSS Libraries / web-framework
honojsoss-projectOSS Librariesaka hono
honooss-projectOSS Librariesaka hono js

Exploitability

Official Patch Available

References

https://github.com/honojs/hono/security/advisories/GHSA-xrhx-7g5j-rcj5
github.com

Timeline

Published
May 28, 2026
Last Updated
May 29, 2026

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