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Claude Mythos

Reporting on Claude Mythos from Lazy Tensor.

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Cybersecurity & Kernel Security

Anthropic Details Linux CVE-2026-39962 Exploit; Cursor Pulls Backdoor

Claude Mythos chains a CVSS 9.8 remote code execution exploit for CVE-2026-39962 in the Linux MPTCP stack, Microsoft analyzes a tampered Claude Code extension on Cursor, and Apple warns spyware targets in 100+ countries.

Oct 31, 2026By Lazy Tensor3 min read

Editorial Ligne Claire illustration of an analyst inspecting a network routing blueprint and mechanical vault lock with a magnifying glass — Security disclosures on Oct. 30 spanned Anthropic’s autonomous exploitation of Linux kernel vulnerability CVE-2026-39962, Microsoft’s forensic breakdown of a tampered Cursor extension, new Microsoft Teams cross-tenant controls, and mobile hardware defenses.

Cursor Claude Mythos CVE-2026-39962