Dulwich has unbounded memory allocation in receive-pack from crafted thin packs

ImpactAn uncontrolled-resource-consumption memory exhaustion denial-of-service vulnerability CWE-400 / CWE-789.A client with push access could push a tiny crafted thin pack 174 bytes whose delta header declares a huge destsize. When dulwich ingested it via addthinpack / applydelta, it would...