CVE-2022-43552

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.

• CWE-416
• CWE-416
• CWE-416

• http://seclists.org/fulldisclosure/2023/Mar/17Mailing List, Third Party Advisory
• https://hackerone.com/reports/1764858Exploit, Issue Tracking, Third Party Advisory
• https://security.gentoo.org/glsa/202310-12Third Party Advisory
• https://security.netapp.com/advisory/ntap-20230214-0002/Vendor Advisory
• https://support.apple.com/kb/HT213670Third Party Advisory
• http://seclists.org/fulldisclosure/2023/Mar/17Mailing List, Third Party Advisory
• https://hackerone.com/reports/1764858Exploit, Issue Tracking, Third Party Advisory
• https://security.gentoo.org/glsa/202310-12Third Party Advisory
• https://security.netapp.com/advisory/ntap-20230214-0002/Vendor Advisory
• https://support.apple.com/kb/HT213670Third Party Advisory

Published

Feb 9, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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