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CVE-2026-40398 is a heap-based buffer overflow vulnerability in Windows Remote Desktop Services. The flaw allows an authorized attacker who already has local access and only low privileges on a vulnerable Windows system to trigger memory corruption in the Remote Desktop Services attack surface and elevate privileges locally. Available reporting identifies the issue as affecting a broad range of supported Windows client and server releases, including Windows 10 through Windows 11 26H1 and Windows Server 2012 through Windows Server 2025. The vulnerability does not require additional user interaction once the attacker has obtained an authenticated foothold on the target system.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An elevation of privilege vulnerability in Windows Remote Desktop Services.
A buffer overflow elevation-of-privilege vulnerability in Windows Remote Desktop Services that allows an authenticated low-privilege attacker to escalate to SYSTEM.
An important Windows Remote Desktop Services elevation of privilege vulnerability that Microsoft determined is more likely to be exploited.
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.