Input validation error in hono - CVE-2026-24398
Published: July 24, 2026
Vulnerability identifier: #VU139319
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-24398
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass IP-based access controls.
The vulnerability exists due to improper input validation in the IP Restriction Middleware and src/utils/ipaddr.ts when processing client-provided IP addresses for access control decisions. A remote attacker can send a malformed IP address to bypass IP-based access controls.
This is exploitable when the application relies on client-provided IP addresses such as the X-Forwarded-For header for access control decisions.
Affected software
hono
How to mitigate CVE-2026-24398
Install security update from vendor's website.
hono - update to 4.11.7