CVE-2026-69207

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...

CVE-2026-69207

Hono’s built-in CORS middleware (hono/cors) is vulnerable to a ReDoS in the Access-Control-Request-Headers parsing during preflight requests when allowHeaders is unset/empty. The regex-based parser can backtrack quadratically with long whitespace, potentially causing seconds of CPU usage per pref...

Regular Expression Denial of Service (ReDoS)

Overview hono is an Ultrafast web framework for the Edges Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS in the cors middleware during the parsing of the Access-Control-Request-Headers header via a regular expression with quadratic runtime complexit...

GHSA-8J4G-W8FX-2239 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...