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CVE-2026-42909 is a remote code execution vulnerability in Microsoft Remote Desktop Client. The flaw is described as a race condition involving improper synchronization during concurrent execution on a shared resource, and associated reporting also characterizes the issue as a heap-based buffer overflow with use-after-free behavior. An attacker who controls a Remote Desktop Server can trigger the vulnerability when a victim connects to that server using a vulnerable Remote Desktop Client. Successful exploitation requires winning the race condition and can result in attacker-controlled code execution on the client system over the network.
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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.
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Patch, then assume compromise.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Remote Desktop Client remote code execution vulnerability triggered when a victim connects to an attacker-controlled server, leading to a heap-based buffer overflow.
A remote code execution vulnerability in Microsoft Remote Desktop Client caused by a heap-based buffer overflow with race condition/use-after-free characteristics. Exploitation requires a user to connect with a vulnerable Remote Desktop Client to an attacker-controlled Remote Desktop Server.
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.