GHSA-h3q4-6j7f-r24c

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GHSA-h3q4-6j7f-r24c

Summary: priority vulnerable to denial of service

Details: 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.

References: https://nvd.nist.gov/vuln/detail/CVE-2016-6580, https://github.com/python-hyper/priority/commit/7d01a7dc4db83bce50f20d47caf4f37b403a3ecd, https://github.com/pypa/advisory-database/tree/main/vulns/priority/PYSEC-2017-93.yaml, https://github.com/python-hyper/priority, https://python-hyper.org/priority/en/latest/security/CVE-2016-6580.html, https://web.archive.org/web/20160806004329/http://www.securityfocus.com/bid/92311