High severity7.5NVD Advisory· Published Jan 10, 2017· Updated Jun 17, 2026
CVE-2016-6580
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
priorityPyPI | < 1.2.0 | 1.2.0 |
Affected products
4cpe:2.3:a:python:python_priority_library:1.0.0:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:python:python_priority_library:1.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:python:python_priority_library:1.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:python:python_priority_library:1.1.1:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
7- www.securityfocus.com/bid/92311nvdThird Party AdvisoryVDB Entry
- github.com/advisories/GHSA-h3q4-6j7f-r24cghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2016-6580ghsaADVISORY
- python-hyper.org/priority/en/latest/security/CVE-2016-6580.htmlnvdMitigationVendor AdvisoryWEB
- github.com/pypa/advisory-database/tree/main/vulns/priority/PYSEC-2017-93.yamlghsaWEB
- github.com/python-hyper/priority/commit/7d01a7dc4db83bce50f20d47caf4f37b403a3ecdghsaWEB
- web.archive.org/web/20160806004329/http://www.securityfocus.com/bid/92311ghsaWEB
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