Windows Message Queuing Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Message Queuing allows an unauthorized attacker to execute code over an adjacent network.
MSRC compact vulnerability detail
CVE-2026-34329 · Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Message Queuing allows an unauthorized attacker to execute code over an adjacent network.
Signals
Windows Message Queuing
Remote Code Execution
Exploited: No
Publicly disclosed: No
Exploitability: Exploitation Less Likely
CWE
Patch Diff
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Resolved binary override
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Description
Heap-based buffer overflow in Windows Message Queuing allows an unauthorized attacker to execute code over an adjacent network.
FAQ / Articles
FAQ
How could an attacker exploit this vulnerability? An attacker could send a specially crafted message over the network to a system running the Windows Message Queuing (MSMQ) service. This message is processed by the MSMQ service and triggers a memory corruption condition, which could allow the attacker to run code on the affected system.
FAQ
According to the CVSS score, the attack vector is adjacent (AV:A). What does this mean for this vulnerability? This attack is limited to systems connected to the same network segment as the attacker. The attack cannot be performed across multiple networks (for example, a WAN) and would be limited to systems on the same network switch or virtual network.