Orval: RCE via servers[].url -> unescaped request-URL template literal (with getBaseUrlFromSpecification)

### Summary When Orval is configured with `output.baseUrl.getBaseUrlFromSpecification: true`, it bakes the spec's `servers[0].url` into the generated request URL as a template literal without escaping the backtick. A server URL containing a backtick closes the template literal and injects a concatenation expression evaluated when the generated URL/request function is called, executing attacker-controlled code. Verified on Orval 8.19.0 (fetch client); survives default OpenAPI validation. ### Details ```ts return `http://api.x/` + (globalThis.X = require("fs").writeFileSync("/marker","pwned")) + `/v1/u`; ``` Prerequisite: the documented `getBaseUrlFromSpecification: true` option (takes the base URL from the OpenAPI servers block). This is the same output sink as the route-path case (request-URL template literal) reached via the server `url` field. Distinct from Orval's published CVEs (CVE-2026-22785 summary/MCP, CVE-2026-23947 / CVE-2026-25141 x-enumDescriptions, CVE-2026-24132 const/mock). ### PoC `reproduce.sh` (+ `make_spec.py`) attached: generates a fetch client with `getBaseUrlFromSpecification: true`, bundles it, calls the functions, and shows a marker written. Verified on 8.19.0. ### Impact With that option enabled, code execution in any environment that calls a client generated from an attacker-controlled or attacker-influenced OpenAPI description. ### Suggested fix Escape the server URL before emitting it into the URL template literal (escape backtick and `${`), or build the base URL with an encoder that treats it as data; validate the URL. [maintainer-report.txt](https://github.com/user-attachments/files/29396562/maintainer-report.txt) [make_spec.py](https://github.com/user-attachments/files/29396563/make_spec.py) [reproduce.sh](https://github.com/user-attachments/files/29396564/reproduce.sh) Source Code Location: https://github.com/orval-labs/orval Affected Packages: - npm:orval, affected < 8.21.0, patched in 8.21.0 CWEs: - CWE-94: Improper Control of Generation of Code ('Code Injection') - CWE-116: Improper Encoding or Escaping of Output - CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine CVSS: - CVSS_V4: score 9.3, 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 References: - https://github.com/orval-labs/orval/security/advisories/GHSA-88f2-fpv8-89q2 - https://nvd.nist.gov/vuln/detail/CVE-2026-62682 - https://github.com/orval-labs/orval/pull/3692 - https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6 - https://github.com/orval-labs/orval/releases/tag/v8.21.0 - https://github.com/advisories/GHSA-88f2-fpv8-89q2