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CVE-2026-4890: Vulnerability in dnsmasq

June 25, 2026

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One of six vulnerabilities discovered in dnsmasq as part of OpenAI's Daybreak initiative.

Discovered from: OpenAI Expands Daybreak Initiative with GPT-5.5-Cyber to Accelerate Vulnerability Patching

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CVE-2026-4890DNSdnsmasqvulnerability

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