LayerZero Labs contributed the following description of LayerZero OApp & OFT:

LayerZero is a generic messaging protocol. OFT and OApp are libraries built on top of LayerZero for developers to leverage when building on LayerZero.

Zellic conducted a security assessment for LayerZero Labs from May 12th to May 30th, 2024, as well as from September 11th to September 16th, 2025. During this engagement, Zellic reviewed LayerZero OApp & OFT's code for security vulnerabilities, design issues, and general weaknesses in security posture.