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CVE-2026-45639 is an information disclosure vulnerability in the Windows Remote Desktop Protocol (RDP) stack caused by an out-of-bounds read. A remote, unauthenticated attacker can send crafted RDP traffic to trigger the flaw and cause the vulnerable service to return data from adjacent memory regions. The issue is reachable pre-authentication over the network and requires no user interaction. Successful exploitation can expose portions of process memory, including potentially sensitive protocol state and other in-memory data. Microsoft rated the vulnerability Important and assigned it a CVSS v3 base score of 7.5.
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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.
1 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.