Hono: Non-breaking space prefix bypass in cookie name handling in getCookie()

Summary A discrepancy between browser cookie parsing and parse handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse, allowing attacker-controlled cookies to override legitimate ones. Details...

PT-2026-31284

Name of the Vulnerable Software and Affected Versions Hono versions prior to 4.12.12 Description A discrepancy between browser cookie parsing and parse handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same...