CVE-2026-47675 — Hono: Cookie helper does not sanitize sameSite and priority, allowing Set-Cookie injection
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…
Published: 2026-05-28 · CVSS: 4.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7