{"id":"CVE-2026-103918","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-103918","generatedAt":"2026-10-28T10:47:59.550Z","title":"A remote client that can reach a procedure with an object or record input can supply __proto__ to replace the prototype of the returned request object, allowing attacker-controlled inherited values to reach application lookups.","description":"oRPC is a tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards. Prior to 1.14.10, the @orpc/zod ZodSmartCoercionPlugin and experimental_ZodSmartCoercionPlugin collect object and record properties in plain objects and resolve shape keys through the prototype chain. A remote client that can reach a procedure with an object or record input can supply __proto__ to replace the prototype of the returned request object, allowing attacker-controlled inherited values to reach application lookups. For object schemas, keys such as constructor, toString, and __proto__ can instead resolve inherited members as Zod schemas and cause an unhandled TypeError before validation. The global Object.prototype, unrelated objects, other requests, and other users are not modified, and the availability effect is limited to crafted requests rather than persistent process-wide state. This issue is fixed in version 1.14.10.","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":0.00248,"percentile":0.16024,"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 (0.25%). 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":"2026-10-02T20:17:00.067Z"},"summary":"New CVE, medium severity (CVSS 6.5)."}],"references":[{"url":"https://github.com/middleapi/orpc/commit/26314dfb443237c495116c5794d3d30a7a22c570","source":"security-advisories@github.com"},{"url":"https://github.com/middleapi/orpc/pull/1727","source":"security-advisories@github.com"},{"url":"https://github.com/middleapi/orpc/releases/tag/v1.14.10","source":"security-advisories@github.com"},{"url":"https://github.com/middleapi/orpc/security/advisories/GHSA-gcgf-fh7c-8gf2","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-103918","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."}