HTTP/2 Python Priority Library Vulnerability: Memory Exhaustion and High CPU Usage

CVE-2016-6580 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:N/A:P

A HTTP/2 implementation built using any version of the Python priority library prior to version 1.2.0 could be targeted by a malicious peer by having that peer assign priority information for every possible HTTP/2 stream ID. The priority tree would happily continue to store the priority information for each stream, and would therefore allocate unbounded amounts of memory. Attempting to actually use a tree like this would also cause extremely high CPU usage to maintain the tree.

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