January 24, 2026—KB5078127 (OS Builds 26200.7628 and 26100.7628) Out-of-band

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CVE-2021-40836: Undefined Security Weakness

A vulnerability affecting F-Secure antivirus engine was discovered whereby scanning MS outlook .pst files can lead to denial-of-service. The vulnerability can be exploited remotely by an attacker. A successful attack will result in denial-of-service of the antivirus engine...