Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

Related CVEs

CVE-2019-9511

Key Information

GHSA ID

GHSA-89fc-749h-w2fj

Published

May 24, 2022 4:53 PM

Last Modified

January 14, 2025 9:31 PM

CVSS Score

7.5 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 28, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.