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CVE-2026-54990 is a critical remote code execution vulnerability in Microsoft Remote Desktop Client caused by a heap-based buffer overflow. The flaw can be triggered over the network when a vulnerable Remote Desktop Client processes specially crafted responses from a malicious Remote Desktop Protocol server during connection handling. Successful exploitation allows arbitrary code execution on the client system in the security context of the logged-on user. Affected products include Windows 11 versions 24H2, 25H2, and 26H1, as well as Windows Server 2025, including Server Core installations, within the vulnerable build ranges published by Microsoft.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.