Vulnerability Description
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
CVSS Score
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 11 23H2 | < 10.0.22631.7517 |
| Microsoft | Windows 11 24H2 | < 10.0.26100.9106 |
| Microsoft | Windows 11 25H2 | < 10.0.26200.9106 |
| Microsoft | Windows 11 26H1 | < 10.0.28000.2704 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5440 |
| Microsoft | Windows Server 2025 | < 10.0.26100.33222 |
Related Weaknesses (CWE)
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815Vendor AdvisoryPatch
FAQ
What is CVE-2026-62815?
CVE-2026-62815 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-62815?
CVE-2026-62815 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-62815?
Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 23H2, Microsoft Windows 11 24H2, Microsoft Windows 11 25H2, Microsoft Windows 11 26H1, Microsoft Windows Server 2022.