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CVE-2026-34329 is a heap-based buffer overflow vulnerability in Microsoft Windows Message Queuing (MSMQ). The flaw is triggered when the MSMQ service processes a specially crafted inbound queue message and fails to properly validate message data before writing beyond a heap-allocated buffer. This memory corruption condition can overwrite adjacent heap structures and redirect execution flow, allowing arbitrary code execution in the context of the MSMQ service process. The vulnerability is reachable over an adjacent network and does not require authentication or user interaction. Affected systems are supported Windows client and server platforms where MSMQ is installed and actively running.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap-based buffer overflow remote code execution vulnerability in Microsoft Message Queuing (MSMQ) that allows an unauthorized attacker on an adjacent network to execute code by sending a specially crafted message to the MSMQ service.
A heap-based buffer overflow remote code execution vulnerability in the Windows Message Queuing (MSMQ) service that allows unauthenticated, zero-click exploitation from an adjacent network.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.