EUVD-2026-44106
GHSA-vgq9-7jrx-rfx5
Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable MSMQ service with authenticated low-privilege attacker (PR:L) and a hard-to-win use-after-free race (AC:H) yielding full code execution (C/I/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Message Queuing allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Microsoft Windows Message Queuing (MSMQ) service arises from a use-after-free (CWE-416) memory-corruption flaw that an authenticated attacker can trigger across a network to run arbitrary code in the service context. It affects a broad range of supported Windows client and server releases from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025 wherever the MSMQ component is enabled. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the Windows Message Queuing (MSMQ) optional feature is installed and running on the target and reachable over the network (the Mqsvc listener). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderately, not maximally, alarming. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-level authenticated access to a network segment sends a crafted sequence of MSMQ messages to a host where the Message Queuing service is enabled, triggering the use-after-free to corrupt heap memory and hijack execution in the service process. Given AC:H, the attacker likely needs to win a memory/race condition and may require several attempts. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50505 for each affected OS build as listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50505 (exact per-OS fixed build numbers were not provided in this dataset, so pull them from the Update Guide rather than assuming a single version). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems with MSMQ enabled and assess network exposure to authenticated users, particularly in high-trust environments. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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