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High severity8.1NVD Advisory· Published Sep 8, 2026· Updated Sep 8, 2026

CVE-2026-78449

CVE-2026-78449

Description

Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.

Affected products

1

Microsoft/Windows Reliable Multicast Transport Driver (RMCAST)llm-fuzzy

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78449nvd

News mentions

1

Massive Microsoft Patch Tuesday September 2026 – 973 Vulnerabilities Fixed, Including 2 Zero-Days
Cyber Security News · Sep 8, 2026