Critical Flaw in ZIP File Processing Enables Malware Bypass of Security Systems

Critical Flaw in ZIP File Processing Enables Malware Bypass of Security Systems

First seen 10 Mar 2026, 17:28 UTC •Kb.CertCybersecuritynewsBleepingcomputerIsc.Sans.EduScworld+1 •83% similarity •69.8

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A vulnerability tracked as CVE-2026-0866 allows attackers to exploit malformed ZIP headers to evade detection by antivirus and EDR systems. This flaw can lead to malicious payloads being executed without triggering security alerts, affecting users relying on these security measures. The issue highlights significant weaknesses in how these systems handle archive files.

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Timeline

2004-11-19
CVE-2004-0935 published
2026-03-09
Kb.Cert article published detailing the vulnerability
2026-03-10
CVE-2026-0866 disclosed in cybersecurity articles
2026-03-10
Cybersecuritynews article published discussing the flaw

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