CVE-2026-47675 — Hono: Cookie helper does not sanitize sameSite and priority, allowing Set-Cookie injection

CVE-2026-47675

Hono: Cookie helper does not sanitize sameSite and priority, allowing Set-Cookie injection PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
honojs / hono	affected < 4.12.21

CWE

CWE-113, CWE-1287

References

https://github.com/honojs/hono/security/advisories/GHSA-3hrh-pfw6-9m5x

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.