EUVD-2026-73916
GHSA-qccp-hfx7-324f
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable UAF requiring heap-grooming precision (AC:H); MSMQ accepts unauthenticated messages (PR:N); full CIA impact from code execution in service process.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Windows Message Queuing (MSMQ) allows unauthenticated network attackers to execute arbitrary code via a use-after-free memory corruption condition. The vulnerability spans Windows 10, Windows 11, and Windows Server 2022/2025 across multiple feature-release versions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | MSMQ must be installed and enabled on the target Windows system - it is an optional Windows feature, not installed by default. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) reflects that this is a high-severity but non-trivial-to-exploit vulnerability: unauthenticated network reachability is paired with high attack complexity, which historically for UAF means reliable exploitation requires non-trivial heap-grooming. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply Microsoft's patch via Windows Update or WSUS, targeting the fixed build numbers listed per version: Windows 10 21H2 to 10.0.19044.7725 or later, Windows 10 22H2 to 10.0.19045.7725 or later, Windows 11 23H2 to 10.0.22631.7582 or later, Windows 11 24H2 to 10.0.26100.9445 or later (also Windows Server 2025), Windows 11 25H2 to 10.0.26200.9445 or later, Windows 11 26H1 to 10.0.28000.2954 or later, and Windows Server 2022 to 10.0.20348.5622 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all Windows 10, Windows 11, Windows Server 2022, and Windows Server 2025 systems with Message Queuing enabled; prioritize production systems and those supporting business-critical MSMQ-dependent applications. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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