Local privilege escalation via SMB heap overflow
Published Sep 8, 2026 · Updated Sep 9, 2026
Heap-based buffer overflow in Microsoft Windows 11 version 26H1 allows local users to elevate privileges through the SMB Client. Microsoft identifies the affected component and memory-corruption class but has not published the specific SMB message field, parsing routine, or unchecked heap operation that triggers the overwrite. A low-privileged local account is required, and successful exploitation grants higher privileges on the affected host.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows 11 version 26H1 allows local users to elevate privileges through the SMB Client. Microsoft identifies the affected component and memory-corruption class but has not published the specific SMB message field, parsing routine, or unchecked heap operation that triggers the overwrite. A low-privileged local account is required, and successful exploitation grants higher privileges on the affected host.
The record
- CVE
- CVE-2026-69544
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows 11, version 26H1
- Classifications
- CWE-122, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 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=10.0.28000.0 <10.0.28000.2954
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
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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