GHSA-4x5r-pxfx-6jf8

Dashboard / Vulnerabilities / GHSA-4x5r-pxfx-6jf8

GHSA-4x5r-pxfx-6jf8

Summary: @babel/core: Arbitrary File Read via sourceMappingURL Comment

Details: ## Impact Using `@babel/core` to compile maliciously crafted code can allow ab attacker to read any source map from the system that is running Babel, if these conditions are _all_ true: - the attacker controls the input source code - the attacker can read the output source code - the attacker knows the path of the source map file that they want to read **Users that only compile trusted code are not impacted.** ## Patches The vulnerability has been fixed in `@babel/[email protected]` and `@babel/[email protected]`. ## Workarounds Callers can mitigate the issue without upgrading by setting [`inputSourceMap: false`](https://babeljs.io/docs/options#inputsourcemap) in their Babel options. Callers can also manually extract the `#sourceMappingURL` comment from the input source code, validate whether the source map that it links to is allowed to be read, and if it is pass an object to `inputSourceMap` (passing `false` when it's not). ## Credits Thanks Teodor-Cristian Radoi for reporting the vulnerability.

References: https://github.com/babel/babel/security/advisories/GHSA-4x5r-pxfx-6jf8, https://nvd.nist.gov/vuln/detail/CVE-2026-49356, https://babeljs.io/docs/options#inputsourcemap, https://github.com/babel/babel