This package allowed ../ directory traversal to access private resources because resource matching did not ensure that pathnames were in a canonical format.

For Debian 8 Jessie, this problem has been fixed in version 0.2.9-1+deb8u1.

We recommend that you upgrade your ruby-rack-cors packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS