GHSA-88f2-fpv8-89q2

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GHSA-88f2-fpv8-89q2

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

Details: ### 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)

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, https://github.com/orval-labs/orval/releases/tag/v8.21.0