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.

CVSS breakdown

Affected products

• socat / socat1.8.0.0 – 1.8.1.2

References

• MISChttp://www.dest-unreach.org/socat/CHANGES
• VENDOR_ADVISORYhttps://www.vulncheck.com/advisories/socat-heap-buffer-overflow-via-socks5-reply-parser