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CVE-2026-42985 is a critical remote code execution vulnerability in Microsoft Remote Desktop Client. The flaw is described as a heap-based memory corruption condition and specifically mapped to CWE-416 use-after-free. Exploitation occurs when a victim uses a vulnerable Remote Desktop Client to connect to an attacker-controlled or otherwise malicious Remote Desktop server. During the RDP session setup or related processing, the malicious server can trigger the memory safety flaw in the client, leading to heap corruption and arbitrary code execution on the victim system. Microsoft assigned the vulnerability a CVSS v3.1 base score of 8.8 and assessed exploitation as more likely.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Remote Desktop Client remote code execution vulnerability assessed as more likely to be exploited within 30 days.
A memory corruption vulnerability affecting remote work scenarios, triggered when a workstation connects to a rogue server presenting a malformed certificate.
A critical heap-based buffer overflow remote code execution vulnerability in Windows Remote Desktop Client that can be triggered when a victim connects to a malicious RDP server.
A critical remote code execution vulnerability in Microsoft Remote Desktop Client caused by a heap-based buffer overflow.
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.