esm.sh: Path Traversal via package.json browser field allows reading arbitrary server files

Summary A Local File Inclusion LFI vulnerability exists in the esbuild plugin's handling of the browser field in package.json. An attacker can publish an npm package that causes the server to read and return arbitrary files from the host filesystem during the build process. Details The vulnerable...

PT-2026-40543

Name of the Vulnerable Software and Affected Versions esm.sh versions 137 and earlier Description A Local File Inclusion LFI issue exists in the esbuild plugin's handling of the browser field within the package.json file. An attacker can publish a malicious npm package that leverages ../ sequence...