UltraVNC vncauth.c uses time-seeded libc rand() to generate VNC authentication challenge bytes_CVE-2026-44040
UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes() function seeds libc rand() with time(0) + getpid() + rand() and generates a 16-byte challenge. Th...