EUVD-2026-44068
GHSA-9fc2-hg5p-q5q3
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Pre-auth network RCE with no user interaction against a network-listening service yields AV:N/AC:L/PR:N/UI:N; memory-corruption code execution gives full C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Message Queuing allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary code over the network by corrupting heap memory. The flaw (CWE-122) carries a CVSS 9.8 and affects a broad range of client and server SKUs from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target host has the optional Message Queuing (MSMQ) feature installed and enabled and that its MSMQ listener (TCP 1801 and associated RPC ports) is network-reachable from the attacker - MSMQ is not enabled by default, so this non-default configuration is the key limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine top-tier priority, not a high-CVSS-but-low-risk case. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach TCP port 1801 on a host with MSMQ enabled sends a single crafted Message Queuing packet that triggers the heap-based buffer overflow in the message parser, corrupting heap memory to hijack execution and run code in the context of the MSMQ service. Because the CVSS vector requires no authentication and no user interaction (PR:N/UI:N) with low complexity (AC:L), a successful exploit needs only network reachability to the service. … |
| Remediation | Vendor-released patch: apply the Microsoft security update for CVE-2026-50447 for your specific OS build via Windows Update or WSUS/SCCM; consult the per-SKU fixed build numbers in the Microsoft Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50447 to confirm the exact patched version for each affected system. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Windows Message Queuing across Windows 10 (1607-26H1), Windows 11, and Windows Server (2012-2025) SKUs, prioritizing internet-exposed and critical systems. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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