GHSA-2h9g-j24r-h63g Orval: Import-time RCE via array-items default -> zod module-level template literal

• npm orval: < 8.21.0 → fixed in 8.21.0

Summary Orval's zod schema generation emits the array-items `default` value as a module-level template literal (`export const …Default = ``;`) without escaping `${` or the backtick. A default of the form `v${}w` injects a live JavaScript expression evaluated when the generated zod schema module is imported, executing attacker-controlled code at import — no request or function call needed. Verified on Orval 8.19.0; survives default OpenAPI validation. Details ```ts export const …Default = `v${globalThis.ORVPWN()}w`; // ${...} = arbitrary JS expression, runs at import ``` Malicious input: an array property (string items) with a `default` of `v${}w`. `${...}` permits any JS expression. Note: this is one of several `default`-bearing positions that reach the same unescaped zod template-literal sink; a single fix (escape `default` values) closes all of them, and a CNA may choose to consolidate the related reports. PoC `reproduce.sh` (+ `make_spec.py`) attached: generates the zod schema with default validation, bundles it, imports it, and shows a marker written at import. Verified on 8.19.0. Impact Code execution at import in any application that imports a zod schema module generated from an attacker-controlled or attacker-influenced OpenAPI description. Suggested fix Emit `default` values via a proper string-literal encoder (JSON.stringify, or escape backtick and `${` if a template literal must be used); never interpolate a spec value into a template literal. Apply to every `default` position. maintainer-report.txt make_spec.pyreproduce.sh