EUVD-2026-44307
GHSA-h9cr-8qw2-fhg7
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable RDS service, low complexity and no user interaction, but requires a low-privilege authenticated foothold (PR:L); memory-corruption RCE yields full C/I/A impact within an unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Remote Desktop Services allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Windows Remote Desktop Services (RDS) allows an authenticated network attacker to run arbitrary code by triggering a use-after-free (CWE-416) memory corruption condition. The flaw affects a broad range of currently-supported Windows client and server builds - Windows 10 21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2022/2025 (including Server Core). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to be running Remote Desktop Services with its RDP listener reachable by the attacker over the network, and the attacker must hold low-level authorization (CVSS PR:L) - i.e., a valid low-privilege credential or authenticated session, not anonymous access. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a genuine, high-priority issue rather than an inflated high-CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker holding a low-privilege foothold - a valid RDP user account or reachable authenticated session on a network-exposed Windows host - connects to the Remote Desktop Services endpoint and sends crafted RDP traffic that triggers the use-after-free, grooming the heap to reclaim the freed object and hijack execution to run code in the RDS process context. With C:H/I:H/A:H impact this yields code execution and can serve as a pivot for lateral movement. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-58626 via Windows Update / WSUS / your patch-management tooling, selecting the cumulative update that matches each affected branch (Windows 10 21H2/22H2, Windows 11 24H2/25H2/26H1, Windows Server 2022/2025 and Server Core); exact per-build fixed versions are listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58626. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory Windows 10 (21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2022/2025 systems with Remote Desktop Services enabled; prioritize domain controllers, administrative servers, and systems handling sensitive data. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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