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Hono Framework CVE-2026-47675

| EUVD-2026-32925 MEDIUM
HTTP Response Splitting (CWE-113)
2026-05-28 GitHub_M
Information Disclosure Hono
4.3
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch available
May 28, 2026 - 18:02 EUVD
Analysis Generated
May 28, 2026 - 17:24 vuln.today

DescriptionNVD

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.

AnalysisAI

HTTP response header injection in Hono's cookie serialize() function allows unauthenticated remote attackers to inject arbitrary Set-Cookie attributes when an application passes user-controlled input into the sameSite or priority cookie options. All Hono releases prior to 4.12.21 are affected across every supported JavaScript runtime. …

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CVE-2026-47675 vulnerability details – vuln.today
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