CVE-2016-6580: python python_priority_library Resource Management Errors
Vulnerability summary
CVE-2016-6580 is a high (CVSS 7.5) Resource Management Errors vulnerability in python python_priority_library. EPSS estimates a 1.81% chance of exploitation in the next 30 days, higher than 78.2% of scored vulnerabilities.
Timeline
- 10-01-2017PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 2 sources · 3 versions- OSV · PypiEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.81%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
0.00 pp
From 1.81% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
PyPI1 product
- priority< 1.2.0
Python1 product
- python_priority_library1.0.0 | 1.1.0 | 1.1.1
2 vendors · 2 products
References
8 links- python-hyper.org/priority/en/latest/security/CVE-2016-6580.htmlX Refsource CONFIRMMitigationVendor AdvisoryWEB
