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CVE-2014-5244 is a denial-of-service vulnerability in the Symfony HttpFoundation component. The issue is triggered when Request::getHost() performs hostname validation on a maliciously long HTTP Host header. Processing an arbitrarily long hostname causes excessive computation during validation, allowing an attacker to consume application resources with crafted requests. The affected branches include Symfony HttpFoundation / Symfony 2.0.x, 2.1.x, 2.2.x, and vulnerable releases prior to the fixed versions in the maintained branches.
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