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
Published Jan 10, 2017
6.6
MEDIUMCVSS 4.0
EPSS 1.81%
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.
Affected products
No data.
- 1.0.0
- 1.1.0
- 1.1.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.81% (0.01807) | 77.78th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.79% (0.01792) | 75.45th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.48% (0.00476) | 62.84th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.10% (0.00096) | 42.02th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.10% (0.00096) | 40.75th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.10% (0.00096) | 38.73th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00885) | 26.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
References (7)
- http://www.securityfocus.com/bid/92311 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://github.com/advisories/GHSA-h3q4-6j7f-r24c Advisory
- https://github.com/pypa/advisory-database/tree/main/vulns/priority/PYSEC-2017-93.yaml
- https://github.com/python-hyper/priority/commit/7d01a7dc4db83bce50f20d47caf4f37b403a3ecd
- https://nvd.nist.gov/vuln/detail/CVE-2016-6580
- https://python-hyper.org/priority/en/latest/security/CVE-2016-6580.html x_refsource_CONFIRMMitigationVendor Advisory
- https://web.archive.org/web/20160806004329/http://www.securityfocus.com/bid/92311
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/92311 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://github.com/advisories/GHSA-h3q4-6j7f-r24c | Advisory | |
| https://github.com/pypa/advisory-database/tree/main/vulns/priority/PYSEC-2017-93.yaml | ||
| https://github.com/python-hyper/priority/commit/7d01a7dc4db83bce50f20d47caf4f37b403a3ecd | ||
| https://nvd.nist.gov/vuln/detail/CVE-2016-6580 | ||
| https://python-hyper.org/priority/en/latest/security/CVE-2016-6580.html | x_refsource_CONFIRMMitigationVendor Advisory | |
| https://web.archive.org/web/20160806004329/http://www.securityfocus.com/bid/92311 |
Change history (0)
No recorded changes yet.