Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-42985 is a critical remote code execution vulnerability in Microsoft Remote Desktop Client. The flaw is described in the provided content as a heap-based buffer overflow / memory corruption issue, and Microsoft also mapped it to CWE-416 (use-after-free). Exploitation is possible over the network when a victim using a vulnerable Remote Desktop Client connects to an attacker-controlled or rogue Remote Desktop server. The malicious server can present malformed data, including a malformed security certificate as noted in the supporting contexts, to trigger the memory corruption condition in the client and achieve code execution on the victim system. Microsoft assigned CVSS v3.1 8.8 and assessed exploitation as more likely.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A Remote Desktop Client remote code execution vulnerability triggered by connecting to an attacker-controlled server; Microsoft assessed this specific flaw as more likely to be exploited.
The version that knows your environment.
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.