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CVE-2026-103036— @orpc/json-schema: Prototype injection in smart coercion

Quick assessment

Affected
middleapi orpc
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.

oRPC 是一个用于构建端到端类型安全且符合 OpenAPI 标准的 API 的工具。在版本 1.14.9 之前， 中的 SmartCoercionPlugin 使用 JsonSchemaCoercer 来以普通对象形式收集对象属性，并通过原型链解析 条目。任何能够访问带有对象输入模式的过程的远程客户端，可以通过提供 来替换单个被强制转换请求对象的原型，或者提供 的成员名称（如 和 ），使得继承的值被当作子模式处理并满足强制转换器的验证检查。因此，攻击者控制的继承属性可能会影响处理程序、 或配置查找逻辑，而合法的

CVSS 6.5 · Medium EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
middleapi orpc < 1.14.9 affected
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I. Basic Information for CVE-2026-103036

Vulnerability Information
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Vulnerability Title
@orpc/json-schema: Prototype injection in smart coercion
Source: CVE Program / CVE List V5
Vulnerability Description
oRPC is a tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards. Prior to 1.14.9, the @orpc/json-schema SmartCoercionPlugin uses JsonSchemaCoercer to collect object properties in a plain object and to resolve schema.properties entries through the prototype chain. A remote client that can reach a procedure with an object input schema can supply __proto__ to replace the prototype of the single coerced request object, or supply Object.prototype member names such as constructor and toString so inherited values are treated as sub-schemas and pass the coercer's satisfaction check. Attacker-controlled inherited properties can consequently affect handler, Object.assign, or configuration lookups, while legitimate __proto__ properties are dropped. The global Object.prototype, unrelated objects, other requests, and other users are not modified, and downstream schema validation still runs. This issue is fixed in version 1.14.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
middleapi orpc < 1.14.9 -

II. Public POCs for CVE-2026-103036

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III. Intelligence Information for CVE-2026-103036

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Patches & Fixes for CVE-2026-103036 (2)

Vendor Advisories for CVE-2026-103036 (1)

Other References for CVE-2026-103036 (1)

IV. Related Vulnerabilities

Same product: orpc
Same vendor: middleapi
Same weakness: CWE-915

V. Comments for CVE-2026-103036

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