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

Quick assessment

Affected
honojs hono
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.21之前版本存在安全漏洞，该漏洞源于serialize()函数未对sameSite和priority选项进行验证，可能导致应用程序将用户控制的输入传递给这些选项时产生包含攻击者选择的附加属性的Set-Cookie响应标头。

CVSS 4.3 · Medium EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1556.005 · Reversible Encryption

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.21 affected
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I. Basic Information for CVE-2026-47675

Vulnerability Information
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Vulnerability Title
Hono: Cookie helper does not sanitize sameSite and priority, allowing Set-Cookie injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.21之前版本存在安全漏洞，该漏洞源于serialize()函数未对sameSite和priority选项进行验证，可能导致应用程序将用户控制的输入传递给这些选项时产生包含攻击者选择的附加属性的Set-Cookie响应标头。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs hono < 4.12.21 -

II. Public POCs for CVE-2026-47675

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III. Intelligence Information for CVE-2026-47675

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Vendor Advisories for CVE-2026-47675 (1)

Same Patch Batch · honojs · 2026-05-28 · 4 CVEs total

CVE-2026-47674 5.3 MEDIUM Hono: IP Restriction bypasses static deny rules for non-canonical IPv6
CVE-2026-47676 5.3 MEDIUM Hono: app.mount() strips mount prefix using undecoded path, causing incorrect routing for
CVE-2026-47673 4.8 MEDIUM Hono: JWT middleware accepts any Authorization scheme, not only Bearer

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-113

V. Comments for CVE-2026-47675

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