CVE-2019-9511
HIGH7.5EPSS 13.7%nghttp2 - security update
Published: 8/13/2019Modified: 4/28/2026
Description
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.
Affected packages (8)
- Alpine/nghttp2from 0, < 1.39.2-r0
- Alpine/nginxfrom 0, < 1.16.1-r0
- Alpine/nodejsfrom 0, < 10.16.3-r0
- Debian/nghttp2from 0, < 1.18.1-1+deb9u1
- Debian/nghttp2from 0, < 1.39.2-1
- Debian/nginxfrom 0, < 1.14.2-3
- Debian/nginxfrom 0, < 1.10.3-1+deb9u3
- Debian/nodejsfrom 0, < 10.16.3~dfsg-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |