Package : ruby1.9.1 Version : 184.108.40.206-2+deb6u6 CVE ID : CVE-2014-6438
It was discovered that the uri package in the Ruby standard library uses regular expressions that may result in excessive backtracking. Ruby applications that parse untrusted URIs using this library were susceptible to denial-of-service attacks by passing crafted URIs.
For the oldoldstable distribution (squeeze), this problem has been fixed in version 220.127.116.11-2+deb6u6.
The oldstable distribution (wheezy) and stable distribution (jessie) were not affected by this problem as it was fixed before release.
-- Ben Hutchings - Debian developer, member of Linux kernel and LTS teams