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CVE-2026-62790 is a high-severity remote code execution vulnerability in Windows SMB Server, specifically affecting SMBv3 implementations across multiple supported Windows client and server releases. The flaw is a heap-based buffer overflow, indicating that crafted network input processed by the SMB server can cause memory corruption in heap-allocated data structures. Microsoft classifies the issue as exploitable by an authorized attacker over a network, which aligns with a low-privilege, authenticated attack path against an exposed SMB service. Successful exploitation can result in arbitrary code execution in the context of the vulnerable SMB server process.
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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.