CVE-2026-56123

A flaw was found in socat. A remote attacker, acting as a malicious SOCKS5 proxy server, can exploit a heap-based buffer overflow. This vulnerability, caused by a sign-extension flaw in the DOMAINNAME reply parser, allows the attacker to write arbitrary data to memory. This could lead to arbitrar...

CVE-2026-56123 socat 1.8.0.0 - 1.8.1.1 Heap Buffer Overflow via SOCKS5 Reply Parser

socat versions 1.8.0.0 through 1.8.1.1 contain a heap-based buffer overflow vulnerability that allows a malicious SOCKS5 proxy server to overwrite adjacent heap memory by exploiting a sign-extension flaw in the DOMAINNAME reply parser. During connection setup, the domain name length byte is read...