CVE-2026-103036
MediumCVSS 6.5Summary
oRPC is a tool that helps build APIs that are end-to-end type-safe. 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 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.
Risk Assessment
An attacker can affect handler, Object.assign, or configuration lookups, potentially leading to unexpected behavior or data exposure.
Recommendation
Update oRPC to version 1.14.9 or later, which fixes this vulnerability.
Other vulnerabilities in oRPC
See all- CVE-2026-103918Medium
oRPC is a tool that helps build APIs that are end-to-end type-safe. Prior to 1.14.10, the @orpc/zod ZodSmartCoercionPlugin and experimental_ZodSmartCoercionPlugin collect object properties in plain objects and resolve shape keys through the prototype chain. A remote client can supply __proto__ to replace the prototype of the returned request object, allowing attacker-controlled inherited values to reach application lookups.
- CVE-2026-77360Medium
oRPC is a tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards. Prior to 1.14.8, the @orpc/server CORS plugin in packages/server/src/plugins/cors.ts copies a client's incoming Vary request header into the response instead of controlling Vary as a response-only header and using Origin for request-origin variation. In deployments behind a shared cache, CDN, or reverse proxy that keys responses using Vary, a client can inject arbitrary variation values, pollute cache keys, and cause inconsistent CORS enforcement for other clients.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS