Basement Humidity Controlled Fan - The cracks in the basement wall will not normally weaken the arrangement of your foundation, but they will cause different difficulties namely, water problems.
When it rains out, especially if you don't have functional and clean gutters, lots of the water builds up from the outside of your basement wall. If you don't get routine basement wall fix to keep those cracks closed, some of the water will get into your basement through those cracks. Even if your basement has a waterproofing membrane on all of the outside walls, a Substantial enough crack can tear or even shred the membrane and then you are in trouble all over again.
Most such cracks can be repaired from the inside in a timely and cost-effective manner that doesn't disturb the soil or that which remains of the waterproof membrane on the outside. Particularly handy homeowners can even attempt it themselves, but it is not recommended unless you already know exactly what you're doing.
The best way to perform the basement wall repair is by injecting a growing liquid urethane foam into the fracture. When the liquid foam experiences water, it expands dramatically, forcing the foam up and down, inward and outward across the entire length and depth of the fracture. It dries and becomes waterproof in moments, sealing the crack perfectly. Since it starts as a liquid of about the same viscosity as water, it is going to go anywhere that the water moves. Since it ends up a foam, it is relatively easy to cut away and, if needed, sand down some of those foam that develops inward though usually, that is not a big issue.