CVE-2026-47674

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.

Score
CVSS 3.1 5.3 Medium
Status
Analyzed - security-advisories@github.com
Published
2026-05-28
Last modified
2026-10-14
Weaknesses
CWE-1289, CWE-185

Affected products

References

 
 
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