GHSA-fv7c-fp4j-7gwp

Description

### Impact Using Babel to compile code that was specifically crafted by an attacker can cause Babel to generate output code that executes arbitrary code. Known affected plugins are: - `@babel/plugin-transform-modules-systemjs` - `@babel/preset-env` when using the [`modules: "systemjs"` option](https://babel.dev/docs/babel-preset-env#modules), as it delegates to `@babel/plugin-transform-modules-systemjs` No other plugins under the `@babel` namespace are impacted. **Users that only compile trusted code are not impacted.** ### Patches The vulnerability has been fixed in `@babel/plugin-transform-modules-systemjs@7.29.4`. Babel also released `@babel/preset-env@7.29.5`, updating its `@babel/plugin-transform-modules-systemjs` dependency, to simplify forcing the update if you are using `@babel/preset-env` directly. ### Workarounds - Pin `@babel/parser` to v7.11.5. The downgrade will completely disable string module name parsing, but it would also disable other new language features and the build pipeline may fail as a result. Only do so if you are working on a legacy codebase and can not upgrade `@babel/plugin-transform-modules-systemjs` to v7.29.4. - Do not use the `modules: "systemjs"` option, migrate the codebase to native ES Modules or any other module formats. ### Credits Babel thanks Daniel Cervera for reporting the vulnerability.