perl may harm your system, because there a ton of programs witch depend on it, to keep your system secure its better to include the following line:
deb http://security.debian.org/ jessie/updates main contrib non-free
sources.list to upgrade/patch the vulnerable packages through
apt as soon as possible.
There are some information about the 3 vulnerabilities:
For the stable distribution (jessie), these problems have been fixed in version 5.20.2-3+deb8u6.
For the oldstable distribution (wheezy), this problem has been fixed in version 5.14.2-21+deb7u3.
For the stable distribution (jessie), this problem has been fixed in version 5.20.2-3+deb8u4.
For the unstable distribution (sid), this problem will be fixed in version 5.22.1-8
The oldstable distribution (wheezy) is not affected by this problem.
For the stable distribution (jessie), this problem has been fixed in version 5.20.2-3+deb8u2.
For the unstable distribution (sid), this problem will be fixed soon.
We recommend that you upgrade your perl packages.
You can list the package that depend on
apt-cache rdepends perl command. The chapter 3 section 3.6.1 Removing Perl deals with the consequence of removing
So, without Perl and, unless you remake these utilities in shell script, you will probably not be able to manage any packages (so you will not be able to upgrade the system, which is not a Good Thing)