CVE-2026-56123

Description

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.

Weakness classification

• disclosure@vulncheck.com: CWE-122

Primary references

• disclosure@vulncheck.com — Release Notes
• disclosure@vulncheck.com — Third Party Advisory