CVE-2026-69207: Inefficient Regular Expression Complexity

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.34, the built-in CORS middleware, hono/cors, is vulnerable to a regular expression denial of service ReDoS. During a preflight OPTIONS request, the middleware parses the attacker-controlled...

Hono: ReDoS in CORS middleware via Access-Control-Request-Headers

Summary The built-in CORS middleware hono/cors parses the attacker-controlled Access-Control-Request-Headers request header during a preflight OPTIONS request using a regular expression whose running time is quadratic in the input length. A single request carrying a long run of whitespace can...

PT-2026-67578

Name of the Vulnerable Software and Affected Versions Hono versions prior to 4.12.34 Description The built-in CORS middleware hono/cors contains a regular expression denial of service ReDoS flaw. During a preflight OPTIONS request, the middleware parses the Access-Control-Request-Headers header...