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CVE-2026-56763— Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option

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 4.12.7之前版本存在输入验证错误漏洞，该漏洞源于parseBody函数在处理启用dot选项的__proto__键时允许创建具有__proto__属性的对象，当解析结果使用不安全合并模式合并到常规JavaScript对象中时，可能导致原型污染并修改对象行为。

CVSS 4.8 · Medium EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Hono Hono < 4.12.7 affected
4.12.7 unaffected
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I. Basic Information for CVE-2026-56763

Vulnerability Information
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Vulnerability Title
Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option
Source: CVE Program / CVE List V5
Vulnerability Description
Hono before 4.12.7 allows __proto__ key in parseBody with dot option enabled, permitting specially crafted form field names to create objects with __proto__ properties. When parsed results are merged into regular JavaScript objects using unsafe merge patterns, attackers can exploit this to achieve prototype pollution and modify object behavior.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
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 4.12.7之前版本存在输入验证错误漏洞，该漏洞源于parseBody函数在处理启用dot选项的__proto__键时允许创建具有__proto__属性的对象，当解析结果使用不安全合并模式合并到常规JavaScript对象中时，可能导致原型污染并修改对象行为。
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 ~ 4.12.7 -

II. Public POCs for CVE-2026-56763

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III. Intelligence Information for CVE-2026-56763

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Vendor Advisories for CVE-2026-56763 (2)

IV. Related Vulnerabilities

Same product: Hono
Same vendor: Hono
Same weakness: CWE-1321

V. Comments for CVE-2026-56763

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