CVE-2026-47675: Hono

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the serialize() function in hono/cookie validates domain and path options against characters that corrupt Set-Cookie header syntax (;, \r, \n), but does not apply the same validation to sameSite and priority. An application that passes user-controlled input into either option may produce a Set-Cookie response header containing attacker-chosen additional attributes. This vulnerability is fixed in 4.12.21.

Affected products

• Hono Hono: before 4.12.21 (fixed in 4.12.21)

Published 2026-05-28. Last modified 2026-06-17.