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CVE-2026-56762— Hono - Missing Cookie Name Validation in setCookie()

Quick assessment

Affected
Hono 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团队开源的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.12之前版本存在输入验证错误漏洞，该漏洞源于在setCookie()、serialize()和serializeSigned()函数中未验证cookie名称，当应用程序传递用户控制的cookie名称时允许无效字符（如控制字符），导致产生畸形的Set-Cookie标头值，在Node.js和Cloudflare Workers等现代运行时中这些无效标头值被拒绝并导致运行时错误，影响正确性和稳健性，而非确认的标

CVSS 5.3 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol

Affected Version Matrix 2

VendorProduct Version RangeStatus
Hono Hono < 4.12.12 affected
4.12.12 unaffected
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I. Basic Information for CVE-2026-56762

Vulnerability Information
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Vulnerability Title
Hono - Missing Cookie Name Validation in setCookie()
Source: CVE Program / CVE List V5
Vulnerability Description
Hono before 4.12.12 does not validate cookie names on the write path in the setCookie(), serialize(), and serializeSigned() functions, allowing invalid characters such as control characters (e.g. \r or \n) when an application passes a user-controlled cookie name. This can produce malformed Set-Cookie header values. In modern runtimes such as Node.js and Cloudflare Workers, such invalid header values are rejected and cause a runtime error before the response is sent, so header injection or response splitting could not be reproduced; the issue primarily affects correctness and robustness, resulting in runtime errors (availability) rather than confirmed header injection.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono团队开源的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.12之前版本存在输入验证错误漏洞，该漏洞源于在setCookie()、serialize()和serializeSigned()函数中未验证cookie名称，当应用程序传递用户控制的cookie名称时允许无效字符（如控制字符），导致产生畸形的Set-Cookie标头值，在Node.js和Cloudflare Workers等现代运行时中这些无效标头值被拒绝并导致运行时错误，影响正确性和稳健性，而非确认的标
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
Hono Hono 0 ~ 4.12.12 -

II. Public POCs for CVE-2026-56762

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III. Intelligence Information for CVE-2026-56762

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Vendor Advisories for CVE-2026-56762 (2)

IV. Related Vulnerabilities

Same product: Hono
Same vendor: Hono
Same weakness: CWE-20

V. Comments for CVE-2026-56762

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