Trellix has confirmed unauthorized access to a portion of its internal source code repository. The breach affects a major enterprise security vendor whose product lineage spans McAfee Enterprise and FireEye tooling, creating supply chain risk for organizations that depend on Trellix products for endpoint, network, and threat detection. No exploitation of the exposed code has been confirmed, but exposure of proprietary detection logic may enable threat actors to develop evasion techniques targeting Trellix-protected environments.