Multiple security issues have been discovered in the Ruby on Rails web
application development framework, which may result in denial of service,
cross-site scripting, information disclosure or bypass of input
validation.
For the stable distribution (jessie), these problems have been fixed in
version 2:4.1.8-1+deb8u1.
For the unstable distribution (sid), these problems have been fixed in
version 2:4.2.5.1-1.
We recommend that you upgrade your rails packages.