oRPC is a tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards

Why it is Yellow

• CVSS 6.5 medium

References

• https://github.com/middleapi/orpc/commit/8a352622e756e8956311f5836cd5c5b9219c0666
• https://github.com/middleapi/orpc/pull/1726
• https://github.com/middleapi/orpc/releases/tag/v1.14.9
• https://github.com/middleapi/orpc/security/advisories/GHSA-4h5r-cv8j-4456

Original 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.