CVE-2026-47675

Description

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.

PUBLISHED Reserved 2026-05-19 | Published 2026-05-28 | Updated 2026-05-28 | Assigner GitHub_M

Problem types

CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

CWE-1287: Improper Validation of Specified Type of Input

Product status

References

github.com/...s/hono/security/advisories/GHSA-3hrh-pfw6-9m5x

cve.org (CVE-2026-47675)

nvd.nist.gov (CVE-2026-47675)

Download JSON