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 po
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | priority | < 1.2.0 | 1.2.0 |
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
- http://www.securityfocus.com/bid/92311
- https://github.com/advisories/GHSA-h3q4-6j7f-r24c
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-770- Platform
- Python (PyPI)
- Package
priority- Disclosed
- 10.01.2017
- Updated
- 11.10.2026 12:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-h3q4-6j7f-r24c - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2017-93 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: priority
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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