Next.js versions before 9.3.2 have a directory traversal vulnerability. Attackers could craft special requests to access files in the dist directory (.next). This does not affect files outside of the dist directory (.next). In general, the dist directory only holds build assets unless your application intentionally stores other assets under this directory. This issue is fixed in version 9.3.2.

ZEIT Next.js 4 before 4.2.3 has Directory Traversal under the /next request namespace.

A bug in handling the ignore files and directories feature in serve 6.5.3 allows an attacker to read a file or list the directory that the victim has not allowed access to.

A path traversal vulnerability in serve npm package version 7.0.1 allows the attackers to read content of arbitrary files on the remote server.

Next.js before 2.4.1 has directory traversal under the /next and /static request namespace, allowing attackers to obtain sensitive information.

Information exposure through directory listings in serve 6.5.3 allows directory listing and file access even when they have been set to be ignored.

serve node module before 6.4.9 suffers from a Path Traversal vulnerability due to not handling %2e (.) and %2f (/) and allowing them in paths, which allows a malicious user to view the contents of any directory with known path.

serve node module suffers from Improper Handling of URL Encoding by permitting access to ignored files if a filename is URL encoded.

Next.js 7.0.0 and 7.0.1 has XSS via the 404 or 500 /error page.