Versions of send
prior to 0.11.2 are affected by an information leakage vulnerability which may allow an attacker to enumerate paths on the server filesystem.
Update to version 0.11.1 or later.
www.openwall.com/lists/oss-security/2016/04/20/11
github.com/expressjs/serve-static/blob/master/HISTORY.md#181--2015-01-20
github.com/pillarjs/send
github.com/pillarjs/send/commit/98a5b89982b38e79db684177cf94730ce7fc7aed
github.com/pillarjs/send/pull/70
nvd.nist.gov/vuln/detail/CVE-2015-8859
web.archive.org/web/20200227192016/https://www.securityfocus.com/bid/96435