Trellix disclosed a source code repository breach exposing a portion of its codebase to unauthorized access. The company identified the compromise recently and engaged forensic experts to investigate the incident. Trellix notified law enforcement and began remediation immediately. The company did not specify which source code repositories faced compromise, the volume of code exposed, or the identity of threat actors responsible for the unauthorized access. Trellix also declined to detail how attackers breached the repository or what timeline attackers maintained access. This breach affects organizations relying on Trellix security products and platforms. Defenders should monitor for indicators that threat actors leveraged stolen source code to develop exploits or identify zero-day vulnerabilities in Trellix software. Organizations should prioritize patching Trellix products and reviewing logs for unauthorized access. The partial disclosure limits defenders' ability to assess risk exposure and determine whether their environments face elevated threat from code-based attacks. Trellix owns multiple security product lines including McAfee endpoint solutions and Apex endpoint detection and response tools.