{"id":"CVE-2026-103036","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-103036","generatedAt":"2026-10-28T03:41:55.390Z","title":"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…","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.","published":"2026-10-02T20:17:00.000Z","lastModified":"2026-10-06T15:18:12.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"cwe":["CWE-915","CWE-1321"],"affected":[],"epss":{"score":0.00234,"percentile":0.14291,"date":"2026-10-27","history":[{"date":"2026-10-03","score":0.00234,"percentile":0.13052}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-02T20:17:00.000Z","detail":{"score":"6.5","severity":"MEDIUM","publishedAt":"2026-10-02T20:16:59.567Z"},"summary":"New CVE, medium severity (CVSS 6.5)."}],"references":[{"url":"https://github.com/middleapi/orpc/commit/8a352622e756e8956311f5836cd5c5b9219c0666","source":"security-advisories@github.com"},{"url":"https://github.com/middleapi/orpc/pull/1726","source":"security-advisories@github.com"},{"url":"https://github.com/middleapi/orpc/releases/tag/v1.14.9","source":"security-advisories@github.com"},{"url":"https://github.com/middleapi/orpc/security/advisories/GHSA-4h5r-cv8j-4456","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-103036","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}