CVE-2026-56123 | BDVDB-2026-343373 Detail

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.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-06-25Record published in the CVE List.
2. Version 22026-07-14Most recent update recorded in the CVE List.