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Trellix discovers attackers broke into its own source code — potentially exposing weaknesses in the security tools protecting thousands of companies

Trellix, the cybersecurity firm born from the 2022 merger of McAfee Enterprise and FireEye, confirmed in May 2026 that an unauthorized party accessed a portion of its internal source code repository.
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Trellix just admitted hackers broke into its own source-code repository — exposing the cybersecurity firm’s internal tools to outsiders

A cybersecurity company trusted to guard some of the largest networks in the country has confirmed that hackers penetrated its own source-code repository. Trellix, whose endpoint detection and ...