visionmedia send before 0.8.4 for Node.js uses a partial comparison for verifying whether a directory is within the document root, which allows remote attackers to access restricted directories, as demonstrated using "public-restricted" under a "public" directory.
Exploitability
AV:NAC:LAu:NImpact
C:PI:PA:P7.5/AV:N/AC:L/Au:N/C:P/I:P/A:P