static uint64 ReadBits(BitReader* reader, int num_bits) {
  DCHECK_GE(reader->bits_available(), num_bits);
  DCHECK((num_bits > 0) && (num_bits <= 64));
  uint64 value;
  reader->ReadBits(num_bits, &value);
  return value;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.