{"id":"CVE-2026-103036","published":"2026-10-02T20:16:59.567","lastModified":"2026-10-06T15:18:12.170","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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cwes":["CWE-915","CWE-1321"],"vendors":[],"products":[],"references":[{"url":"https://github.com/middleapi/orpc/commit/8a352622e756e8956311f5836cd5c5b9219c0666","tags":[]},{"url":"https://github.com/middleapi/orpc/pull/1726","tags":[]},{"url":"https://github.com/middleapi/orpc/releases/tag/v1.14.9","tags":[]},{"url":"https://github.com/middleapi/orpc/security/advisories/GHSA-4h5r-cv8j-4456","tags":[]}],"exploitRefs":[{"url":"https://github.com/middleapi/orpc/commit/8a352622e756e8956311f5836cd5c5b9219c0666","tags":[]},{"url":"https://github.com/middleapi/orpc/pull/1726","tags":[]},{"url":"https://github.com/middleapi/orpc/releases/tag/v1.14.9","tags":[]},{"url":"https://github.com/middleapi/orpc/security/advisories/GHSA-4h5r-cv8j-4456","tags":[]}],"hasPoc":true,"ai":null}