Cybersecurity Daily: News & Threats · 19 May 2026 · 4 min

NGINX CVE-2026-42945 Exploited, Anthropic Mythos Opens & Canvas Breach Resolved

CVE-2026-42945 moves from disclosure to active exploitation in under 72 hours as attackers target NGINX's rewrite module across millions of exposed servers. Plus: Anthropic expands Project Glasswing sharing rules and the Canvas LMS breach reaches a rare resolution.

Cybersecurity Daily: News & Threats
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NGINX CVE-2026-42945 Exploited, Anthropic Mythos Opens & Canvas Breach Resolved

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NGINX Rift Under Active Attack

CVE-2026-42945 moved from theoretical to actively exploited in under seventy-two hours. That's the lead this morning, and it's the clearest illustration we've had in a while of just how compressed the window between disclosure and exploitation has become.

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Anthropic Opens Mythos Sharing Rules

Shifting to AI-assisted security research, Anthropic has made a notable policy change around Project Glasswing. Until now, partners in that controlled initiative were restricted in what they could share externally.

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Canvas Breach Reaches Unusual Endpoint

The Canvas learning management system incident has reached a resolution that's unusual enough to flag. Instructure has confirmed the threat actor involved in the global security breach returned the stolen data and destroyed their copies.

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Key Signals to Watch

Three things worth tracking from here. On NGINX Rift, the question isn't whether exploitation is happening.

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