OverriddenArticleVoter.php

<?php
namespace HomeNest\Bundle\ThemeBundle\Security\Authorization\Voter;

use ED\BlogBundle\Security\Authorization\Voter\ArticleVoter as EdArticleVoter;

class OverriddenArticleVoter extends EdArticleVoter
{
    public function supportsClass($class)
    {
        try {
            return parent::supportsClass($class);
        } catch (\Error $e) {
            return false;
        }
    }

}

OverrideServiceCompilerPass.php

<?php

namespace HomeNest\Bundle\ThemeBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

class OverrideServiceCompilerPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        if($container->hasDefinition('ed_blog.authorization_voter.article_voter')) {
            $definition = $container->getDefinition('ed_blog.authorization_voter.article_voter');
            $definition->setClass('HomeNest\Bundle\ThemeBundle\Security\Authorization\Voter\OverriddenArticleVoter');
        }
    }
}