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CVE-2026-44799 is a critical remote code execution vulnerability in the Windows Remote Desktop Client caused by a heap-based buffer overflow. The flaw is triggered when a victim uses a vulnerable Remote Desktop Client to connect to an attacker-controlled Remote Desktop Server. During processing of malicious server-supplied data, the client can corrupt heap memory, creating a condition that allows arbitrary code execution in the context of the client system. Microsoft assigned the vulnerability a CVSS v3.1 base vector of AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H and a base score of 7.5. Exploitation was assessed as less likely at publication, with no public disclosure or in-the-wild exploitation reported at that time.
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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.
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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical heap-based buffer overflow remote code execution vulnerability in Windows Remote Desktop Client triggered by connecting to a malicious RDP server.
A critical remote code execution vulnerability in Windows Remote Desktop Client caused by a heap-based buffer overflow.
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 critical remote code execution vulnerability in Microsoft Remote Desktop Client caused by a heap-based buffer overflow. Exploitation requires user interaction and a malicious or attacker-controlled Remote Desktop Server that the victim connects to.
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.