CVE-2016-6580

Description

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.

How to fix CVE-2016-6580

To remediate CVE-2016-6580, upgrade the affected package to a fixed version below.

• —upgrade to 1.2.0 or later
• —upgrade to 1.2.0 or later

Is CVE-2016-6580 being exploited?

Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 1.2.0
• from 0, < 1.2.0

CVSS scores

References (8)

• ADVISORYgithub.com/advisories/GHSA-h3q4-6j7f-r24c
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2016-6580
• PATCHgithub.com/python-hyper/priority
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/priority/PYSEC-2017-93.yaml