CVE-2026-71871 Orval: Import-time RCE via header-parameter default -> zod module-level template literal

Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, a $... expression or backtick in a header parameter default is emitted into a module-level template literal emitted by zod schema generation without safe encoding. This permi...