EUVD-2026-44013
GHSA-4rvc-f57j-w38h
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local heap overflow needing a low-privileged foothold (AV:L/PR:L), no user interaction, and code execution in the privileged MSMQ service yields total C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionNVD
Heap-based buffer overflow in Windows Message Queuing Queue Manager allows an unauthorized attacker to execute code locally.
AnalysisAI
Local privilege escalation via heap-based buffer overflow in the Windows Message Queuing (MSMQ) Queue Manager component lets an authenticated local attacker corrupt heap memory and execute arbitrary code, gaining total control (SYSTEM-level) of the affected host. It impacts a broad range of Windows client and server builds from Windows Server 2012 through Windows 11 25H2/26H1 and Windows Server 2025. Microsoft has released patches; publicly available exploit code exists, though SSVC lists exploitation status as none and EPSS probability is low (0.39%).
Technical ContextAI
Message Queuing (MSMQ) is an optional Windows messaging service whose Queue Manager (mqsvc/mqqm) parses and manages message queues, historically a recurring source of memory-safety bugs (e.g., the 'QueueJumper' family). The root cause here is CWE-122, a heap-based buffer overflow: attacker-controlled input is written past the bounds of a heap allocation inside the Queue Manager, corrupting adjacent heap structures. Because MSMQ processing runs in a privileged service context, controlled corruption of heap metadata or object pointers can be steered into arbitrary code execution. The CPE set spans Windows 10 (1607/1809/21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2012 through 2025, including Server Core installations, indicating the vulnerable code is present across the whole modern Windows codebase wherever the MSMQ feature is installed.
RemediationAI
Apply Microsoft's security update for the corresponding OS build via the MSRC advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54992); Patch available per vendor advisory, with fixed builds per version, e.g., Windows 11 24H2 at 10.0.26100.8875, Windows Server 2022 at 10.0.20348.5386, Windows Server 2025 at 10.0.26100.33158, Server 2012 R2 at 6.3.9600.23291, and Windows 10 22H2 at 10.0.19045.7548 - confirm the exact KB for your build in the update guide before deployment. As a compensating control where patching must be delayed, disable or uninstall the Message Queuing (MSMQ) Windows feature if it is not required, since the vulnerable Queue Manager only runs when MSMQ is installed; the trade-off is loss of any application that depends on MSMQ messaging. If MSMQ must remain enabled, restrict local access and limit which low-privileged users can run code on affected hosts, since exploitation requires an existing local foothold. There is no network-facing feature toggle to disable for this local-vector issue, so patching remains the definitive fix.
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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
Leaving vuln.today