CVE-2022-42916: Apple macOS

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

In curl before 7.86.0, the HSTS check could be bypassed to trick it into staying with HTTP. Using its HSTS support, curl can be instructed to use HTTPS directly (instead of using an insecure cleartext HTTP step) even when HTTP is provided in the URL. This mechanism could be bypassed if the host name in the given URL uses IDN characters that get replaced with ASCII counterparts as part of the IDN conversion, e.g., using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop of U+002E (.). The earliest affected version is 7.77.0 2021-05-26.

Affected products

• Apple macOS: before 12.6.3 (fixed in 12.6.3); from 13.0, before 13.2 (fixed in 13.2)
• Fedoraproject Fedora: version 35 only; version 36 only; version 37 only
• Haxx Curl: from 7.77.0, before 7.86.0 (fixed in 7.86.0)
• Splunk Universal Forwarder: from 8.2.0, before 8.2.12 (fixed in 8.2.12); from 9.0.0, before 9.0.6 (fixed in 9.0.6); version 9.1.0 only

Published 2022-10-29. Last modified 2026-06-17.