CVE-2026-47675

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 4.3
EPSS 0.0004
EPSS Percentile 14.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-113 CWE-1287
Status published
Products (2)
hono/hono < 4.12.21
honojs/hono < 4.12.21
Published May 28, 2026
Tracked Since May 28, 2026