{"@context":"https://openvex.dev/ns/v0.2.0","@id":"https://database.harborguard.co/cve/CVE-2026-56123/vex.json","author":"HarborGuard Database","role":"Document Creator","timestamp":"2026-06-25T15:43:19.580Z","version":1,"tooling":"HarborGuard Database (https://database.harborguard.co)","statements":[{"vulnerability":{"name":"CVE-2026-56123","@id":"https://www.cve.org/CVERecord?id=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 siz"},"products":[{"@id":"cpe:2.3:a:socat:socat:*:*:*:*:*:*:*:*","identifiers":{"cpe23":"cpe:2.3:a:socat:socat:*:*:*:*:*:*:*:*"}}],"status":"affected","action_statement":"Update to a fixed version: 1.8.1.2.","timestamp":"2026-06-25T15:43:19.580Z"}]}