MicrosoftCVE-2026-78450
Microsoft Windows: use after free
High8.1CVE-2026-78450 · Published Sep 8, 2026 · updated Sep 16, 2026
Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Windows 10 Version 1809 Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2019 Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2019 (Server Core installation) Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2022 Product | >= 10.0.20348.0, < 10.0.20348.5622 | 10.0.20348.5622 |
| Windows Server 2025 Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |
| Windows Server 2025 (Server Core installation) Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-416
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