Yes, eggs do raise LDL (bad) cholesterol levels, but the increases are generally modest.
Multiple high-quality meta-analyses consistently show that egg consumption raises LDL cholesterol by approximately 5-8 mg/dL compared to low-egg diets. However, eggs also raise HDL (good) cholesterol, and one recent study suggests saturated fat may have a greater impact on LDL levels than dietary cholesterol from eggs. The clinical significance of these modest LDL increases remains debated.
Caveats
The LDL increases are modest (5-8 mg/dL) and eggs simultaneously raise beneficial HDL cholesterol. Recent evidence suggests saturated fat intake may be more important than dietary cholesterol for LDL levels, and the overall cardiovascular impact depends on the complete dietary pattern.