CVE-2026-56763

描述

## Summary When using `parseBody({ dot: true })` in HonoRequest, specially crafted form field names such as `__proto__.x` could create objects containing a `__proto__` property. If the parsed result is later merged into regular JavaScript objects using unsafe merge patterns, this may lead to prototype pollution in the target object. ## Details The `parseBody({ dot: true })` feature supports dot notation to construct nested objects from form field names. In previous versions, the `__proto__` path segment was not filtered. As a result, specially crafted keys such as `__proto__.x` could produce objects containing `__proto__` properties. While this behavior does not directly modify `Object.prototype` within Hono itself, it may become exploitable if the parsed result is later merged into regular JavaScript objects using unsafe merge patterns. ## Impact Applications that merge parsed form data into regular objects using unsafe patterns (for example recursive deep merge utilities) may become vulnerable to prototype pollution.

如何修補 CVE-2026-56763

要修補 CVE-2026-56763,請將受影響套件升級到下列已修補版本。

• —升級至 4.12.7 或更新版本

CVE-2026-56763 正在被利用嗎?

低 — EPSS 為 0.2%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 4.12.7

CVSS 分數