It was discovered that there was a denial of service attack in
library to make applications HTTP proxy aware. A remote server could cause an
infinite stack recursion.
For Debian 8 Jessie, these problems have been fixed in version 0.4.11-4+deb8u1.
We recommend that you upgrade your libproxy packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/