CVE-2022-43552: Apple macOS

Medium severity, CVSS 5.9. EPSS: 2.5% chance of exploitation in the next 30 days.

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

Affected products

• Apple macOS: from 13.0, before 13.3 (fixed in 13.3)
• Haxx Curl: before 7.87.0 (fixed in 7.87.0)
• 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 2023-02-09. Last modified 2026-06-17.