No, there are no known examples of massless particles that violate the Pauli exclusion principle in nature. The Pauli exclusion principle is a fundamental principle of quantum mechanics that states that no two identical fermions (particles with half-integer spin, such as electrons) can occupy the same quantum state simultaneously.
Massless particles, such as photons (particles of light) and gluons (particles that mediate the strong nuclear force), are bosons with integer spin. Unlike fermions, bosons are not subject to the Pauli exclusion principle. They can occupy the same quantum state simultaneously, leading to phenomena such as the formation of coherent states in the case of photons (e.g., lasers).
The Pauli exclusion principle plays a crucial role in determining the electronic structure of atoms, the behavior of electrons in solids, and many other aspects of quantum systems. It is a fundamental principle that governs the behavior of fermions and has been extensively confirmed by experiments and observations in various domains of physics.