{"id":"CVE-2026-71866","aliases":["GHSA-6mr6-jvcr-2f25"],"url":"https://o3.security/vulnerability/CVE-2026-71866","summary":"Orval: Import-time RCE via schema property name -> computed-property-key injection in the zod client","details":"### Summary\n\norval's zod client emits each schema property name as a double-quoted key in the generated zod.object({...})\nWITHOUT escaping the double quote. A \" in a property name closes the key and lands in object-literal\ncontext, where an injected computed property key [expr] is evaluated when zod.object({...}) runs -- which\nis at MODULE IMPORT (the `export const X = zod.object({...})` executes on load) -> import-time RCE. The\nproperty name is a pure data field. Verified on orval 8.19.0 / Node. CWE-94 / CWE-95 / CWE-116.\n\n### Details\n\n```ts\nexport const OpBody = zod.object({ \"a\":zod.string(),[require(\"fs\").writeFileSync(\"PWNED\",\"\")]:zod.string(),\"b\": zod.string().optional() })\n```\n\nSibling: the MSW mock uses a single-quoted key (' breakout, call-time) -- separate report. The TS interface\nkey is a type (DoS only). Distinct from orval's $ref / route-path / server-url / zod-default findings.\n\n### PoC\n\nreproduce.sh (+ make_spec.py) attached: a property name a\":zod.string(),[require(\"fs\").writeFileSync(\"<marker>\",\"\")]:zod.string(),\"b\n-> zod.object; evaluating it (= importing the module) writes the marker. Verified on 8.19.0.\n\n### Impact\n\nJavaScript / OS command execution (via child_process) at import time for anyone who generates an orval zod\nclient from an attacker-controlled spec and imports it. Estimated Critical, e.g.\n`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`.\n\n### Suggested fix\n\nEscape the property name for the JS string key (JSON.stringify) in the zod.object key generation; never\ninterpolate a raw property name adjacent to [ ] in object-literal position.\n[maintainer-report.txt](https://github.com/user-attachments/files/29426038/maintainer-report.txt)\n[make_spec.py](https://github.com/user-attachments/files/29426039/make_spec.py)\n[reproduce.sh](https://github.com/user-attachments/files/29426040/reproduce.sh)","published":"2026-08-19T17:27:28.222Z","modified":"2026-09-11T03:30:16.177132827Z","cvss":null,"epss":{"score":0.00478,"percentile":0.40206,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"orval","fixedVersion":"8.21.0"}],"fix":{"url":"https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6","label":"orval-labs/orval@8ef1bfd"},"references":[{"type":"WEB","url":"https://github.com/orval-labs/orval/releases/tag/v8.21.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71866.json"},{"type":"ADVISORY","url":"https://github.com/orval-labs/orval/security/advisories/GHSA-6mr6-jvcr-2f25"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71866"},{"type":"FIX","url":"https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6"},{"type":"FIX","url":"https://github.com/orval-labs/orval/pull/3692"},{"type":"PACKAGE","url":"https://github.com/orval-labs/orval"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-11T03:30:16.177132827Z"}}