Authenticated code execution via SMB heap overflow
Published Aug 11, 2026 · Updated Aug 25, 2026
Heap-based buffer overflow in Microsoft Windows SMB Server allows remote authenticated users to execute code over a network. Microsoft has not disclosed the SMBv3 parsing locus or the untrusted length or copy operation that overruns heap storage. Low-privileged SMB access and network reachability are required; successful exploitation executes attacker-controlled code on the target.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows SMB Server allows remote authenticated users to execute code over a network. Microsoft has not disclosed the SMBv3 parsing locus or the untrusted length or copy operation that overruns heap storage. Low-privileged SMB access and network reachability are required; successful exploitation executes attacker-controlled code on the target.
The record
- CVE
- CVE-2026-62790
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9121
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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