What’s Vulnerable › Vulnerabilities

CVE-2026-111757: Hono: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static paths

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-19 · updated 2026-10-20
• Weakness: CWE-174

Description

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.4 until 4.13.11, serveStatic can interpret a malformed percent-encoded path differently from upstream routing middleware and bypass protection for a static prefix. The root cause is serveStatic decodes a routed request path a second time before filesystem lookup. The attack mechanism is malformed percent encoding survives the first routing interpretation and becomes a protected path only during the later static-file decode. The affected component is serveStatic. The trigger conditions are an application protects a static prefix with upstream middleware and serveStatic receives an attacker-controlled malformed percent-encoded path. The impact is unauthorized disclosure of a static file that upstream middleware was intended to protect. The issue does not permit traversal outside the configured static root. This issue is fixed in version 4.13.11.

Affected products

• honojs hono: from 4.12.4, < 4.13.11

References

• https://github.com/honojs/hono/commit/8b05c774ef1555c70f5ba5e2991b7e77cc3635cc
• https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7
• https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7
• https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7
• https://github.com/honojs/hono/security/advisories/GHSA-5r4p-p66f-jhc7

Get alerted when CVE-2026-111757 or the next vulnerability affects your stack