Improper access control in hono - CVE-2026-39407
Published: July 24, 2026
Vulnerability identifier: #VU139310
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-39407
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper access control in serveStatic when handling request paths containing repeated slashes. A remote attacker can send a specially crafted request path to disclose sensitive information.
This issue affects applications that rely on serveStatic together with route-based middleware for access control.
Affected software
hono
How to mitigate CVE-2026-39407
Install security update from vendor's website.
hono - update to 4.12.12