CVE-2018-16844: Apple Xcode

High severity, CVSS 7.5. EPSS: 12.7% chance of exploitation in the next 30 days.

nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive CPU usage. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file.

Affected products

• Apple Xcode: before 13.0 (fixed in 13.0)
• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only
• Debian Debian Linux: version 9.0 only
• F5 Nginx: from 1.9.5, before 1.14.1 (fixed in 1.14.1); from 1.15.0, before 1.15.6 (fixed in 1.15.6)

Published 2018-11-07. Last modified 2026-06-17.