CVE-2026-105016: Microsoft QUIC Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
- Published by source
- 2026-10-13
- First seen by Reality Radar
- 2026-10-22
- Last verified
- 2026-10-22
Affected
- Manufacturer
- Microsoft
- Products
- Windows Server 2022 Windows 11 Version 23H2 Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H2 Windows Server 2025 Windows 11 Version 26H1 Windows 11 version 26H1 Microsoft Visual Studio 2026 version 18.10 Microsoft Visual Studio 2022 version 17.14 .NET 8.0 installed on Windows .NET 9.0 installed on Windows .NET 10.0 installed on Windows .NET 11.0 installed on Windows
- CPE
- cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:x64:*
Whether your exact unit is affected depends on the model, serial number and region in the official notice.
What the official notice says
Risk: Critical — Remote Code Execution
Remedy / actions:
- Install the security update: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5126655
Is this affecting you?
Add what you own or use and Reality Radar will tell you when official changes match it — with evidence and next steps.
Sources
- Microsoft Security Update Guide (MSRC) Tier A · official published 2026-10-13
Evidence ledger
Every piece of evidence we store is appended to a public hash chain, so later edits are detectable. Anyone can re-verify it.
| Entry | Kind | Observed | Evidence hash | Entry hash |
|---|---|---|---|---|
| #103 | new | 2026-10-22 | d9a765a641fa…c195ba | a188a921dd26…89c511 |
Chain head: #1076 8ad5adc30b9b…88ce20