INCIDENT EVIDENCE GRAPH

Hackers target US firms in FastJson RCE zero-day attacks

2026-07-27T23:49:44Z

Hackers are actively exploiting a vulnerability in the FastJson open-source Java library, allowing remote code execution without user interaction or elevated privileges. [...]

• Victim: US firms
• Actor: Hackers
• Exploit: FastJson RCE zero-day
• Method: Exploiting an unauthenticated, no-user-interaction remote code execution vulnerability in FastJson

Primary evidence

1. Hackers target US firms in FastJson RCE zero-day attacks

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