CVE-2026-56123

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 through a signed char field causing a negative bytes_to_read value that is implicitly converted to size_t, resulting in an unbounded heap write into the 262-byte reply buffer with attacker-controlled size and content.

• socat 1.8.1.3-1 [trixie] - socat 1.8.0.3-1+deb13u1 [bookworm] - socat (SOCKS5 client (xio-socks5.c) introduced in 1.8.0.0) [bullseye] - socat (SOCKS5 client (xio-socks5.c) introduced in 1.8.0.0)