CVE-2026-47674

Name of the Vulnerable Software and Affected Versions Hono versions prior to 4.12.21

Description 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, which causes the rule to be silently skipped.

Recommendations Update to version 4.12.21.