CVE-2026-47675Medium· 4.3▾ SunlitHono 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 (;…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 23.7 · likelihood 0.1 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.3%
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.
hono < 4.12.21Upgrade past the affected range:
hono 4.12.21Connected by shared product, vendor, weakness, or advisory.
GHSA-cw3j-28qq-x3xhMedium· 6.5Duplicate Advisory: Hono vulnerable to Vary Header Injection leading to potential CORS Bypass
CVE-2025-71381Medium· 6.5Hono before 4.10.2 (fixed in 4.10.3) contains a flaw in its CORS middleware: when the origin is not set to "*", the middleware copies the Vary header from the incoming request into the response
GHSA-55cm-p4ww-685gMedium· 5.3Duplicate Advisory: Hono missing validation of cookie name on write path in setCookie()
CVE-2026-56762Medium· 5.3Hono missing validation of cookie name on write path in setCookie()
CVE-2026-47676Medium· 5.3Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-47673Medium· 4.8Hono is a Web application framework that provides support for any JavaScript runtime