EUVD-2026-44054
GHSA-pc98-56qf-54j9
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Remote unauthenticated network reach to MSMQ (AV:N/PR:N/UI:N) but use-after-free heap grooming raises complexity (AC:H); RCE yields full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Microsoft Message Queuing Queue Manager allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and server releases, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. An unauthenticated network attacker who can reach the MSMQ service (TCP 1801) can trigger a use-after-free (CWE-416) in the Queue Manager to execute arbitrary code in the service context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Windows system has the optional MSMQ (Message Queuing) feature installed and running, with its Queue Manager reachable by the attacker over the network (typically TCP 1801); on systems without MSMQ enabled - the default for most Windows installs - the vulnerability is not exposed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H yields 8.1 (High): fully remote (AV:N), no privileges (PR:N), no user interaction (UI:N), and full confidentiality/integrity/availability impact - but a High attack complexity (AC:H), which reflects the non-trivial heap manipulation typical of use-after-free RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to a Windows host running the MSMQ service sends a sequence of specially crafted queue messages to TCP port 1801 that manipulate object allocation and freeing inside the Queue Manager, triggering a use-after-free on a dangling pointer. After grooming the heap to place attacker-controlled data where the freed object was, the attacker achieves code execution in the MSMQ service context without any credentials or user interaction. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50439 as detailed in the MSRC Update Guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50439); a vendor patch is available, and administrators should install the KB corresponding to their specific OS/build from that advisory (exact patched build numbers are listed there per platform). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all systems running MSMQ across Windows 10 (1607+), Windows 11 (all versions), and Windows Server 2012-2025; audit network exposure to TCP port 1801 and document internet-facing or DMZ-deployed MSMQ services. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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