EUVD-2026-44290
GHSA-gp42-p8qx-29jv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Unauthenticated network-reachable RDP parsing with no user interaction gives AV:N/AC:L/PR:N/UI:N; a memory-disclosure OOB read yields C:H with I:N/A:N.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Out-of-bounds read in Windows RDP allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Information disclosure in Microsoft Windows Remote Desktop (RDP) allows a remote, unauthenticated attacker to read out-of-bounds memory over the network, potentially leaking sensitive process data from affected systems. The flaw (CWE-125) affects a broad range of Windows client and server releases from Windows Server 2012 through Windows 11 26H1 and Server 2025, and is patched by Microsoft. There is no public exploit identified at time of analysis, and CISA SSVC rates exploitation as none with a low EPSS probability (0.89%).
Technical ContextAI
The vulnerability resides in the Remote Desktop Protocol (RDP) implementation within Windows, the service handling remote graphical sessions typically exposed on TCP/UDP 3389. The root cause is CWE-125 (Out-of-bounds Read): the RDP code parses attacker-influenced network input and reads beyond the bounds of an allocated buffer, returning adjacent heap or stack memory to the attacker. The vendor CPE and EUVD data enumerate the affected component across the Windows RDP stack in both client (Windows 10 1607/1809/21H2/22H2, Windows 11 24H2/25H2/26H1) and server SKUs (Server 2012, 2012 R2, 2016, 2019, 2022, 2025, including Server Core installations). Note the supplied CPE strings use the 'a:' (application) prefix rather than 'o:' (operating system) for these Windows versions, which is atypical but does not change the affected surface.
RemediationAI
Apply the Microsoft security update for CVE-2026-58539 via Windows Update or WSUS; Vendor-released patch fixed builds by SKU are listed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58539 (e.g. Windows 11 24H2/25H2 build 10.0.26100.8875, Server 2025 build 10.0.26100.33158, Server 2012 build 6.2.9200.26226). Where patching cannot be immediate, reduce exposure by restricting RDP (TCP/UDP 3389) to trusted networks, placing it behind a VPN or Remote Desktop Gateway, and enabling Network Level Authentication so that unauthenticated pre-auth parsing is not reachable by arbitrary internet hosts - note NLA does not fully eliminate pre-authentication protocol handling but narrows the attack surface, and blocking 3389 at the perimeter will break any legitimate direct RDP access that relies on it. Prioritize internet-facing RDP servers first.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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