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Zero-daySep 10, 2026

Nightmare-Eclipse Strikes Again with 'ShieldCrash' Windows Exploit

Disgruntled researcher releases 'ShieldCrash' zero-day exploit for Windows Defender.

Summary

A researcher, identified as 'Nightmare-Eclipse', has once again targeted Microsoft by releasing a new zero-day exploit. This exploit, dubbed 'ShieldCrash', specifically targets Windows Defender, a critical security component. The researcher's ongoing vendetta against Microsoft has led to the public disclosure of this vulnerability, potentially exposing numerous Windows users.

Indicators of Compromise

  • malware — ShieldCrash

Entities

Nightmare-Eclipse (threat_actor)Microsoft (vendor)Windows Defender (product)