Description
Use of uninitialized resource in Windows RDP allows an unauthorized attacker to execute code over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 – < 10.0.14393.9339 | 10.0.14393.9339 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – < 10.0.17763.9020 | 10.0.17763.9020 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 – < 10.0.19044.7548 | 10.0.19044.7548 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 – < 10.0.19045.7548 | 10.0.19045.7548 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – < 10.0.26100.8875 | 10.0.26100.8875 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – < 10.0.26200.8875 | 10.0.26200.8875 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – < 10.0.28000.2525 | 10.0.28000.2525 |
| Microsoft | Windows Server 2012 | 6.2.9200.0 – < 6.2.9200.26226 | 6.2.9200.26226 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 – < 6.2.9200.26226 | 6.2.9200.26226 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 – < 6.3.9600.23291 | 6.3.9600.23291 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 – < 6.3.9600.23291 | 6.3.9600.23291 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – < 10.0.14393.9339 | 10.0.14393.9339 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – < 10.0.14393.9339 | 10.0.14393.9339 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – < 10.0.17763.9020 | 10.0.17763.9020 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – < 10.0.17763.9020 | 10.0.17763.9020 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.5386 | 10.0.20348.5386 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.33158 | 10.0.26100.33158 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.33158 | 10.0.26100.33158 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 2 repositories
-
danarhirany300-ctrl/CVE-2026-56190-Full-RCE-Chainn ★ 0 · Nov 4, 2026
Full unauthenticated RCE chain for Windows Server 2022 by chaining CVE-2026-56190 (RCE) and CVE-2026-42908 (Info Leak). Bypasses ASLR, CFG, XFG, and DEP.
-
Udyz/RDPBleed ★ 0 · Oct 29, 2026
CVE-2026-56190 - Windows RDP Server Uninitialized Resource leads to RCE
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- WID-SEC-2026-2316 Microsoft Windows Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 6, 2026
- NCSC-2026-0231 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Jul 14, 2026
- MSRC-CVE-2026-56190 Remote Desktop Protocol Remote Code Execution Vulnerability Microsoft Security Response Center · Jul 14, 2026
References
- Remote Desktop Protocol Remote Code Execution Vulnerability vendor-advisory patch