Local code execution via out-of-bounds read
Published Sep 8, 2026 · Updated Sep 10, 2026
Out-of-bounds read in Microsoft Windows Spaceport.sys allows local users to execute code on affected Windows 10, 11, and Server builds. Spaceport.sys reads beyond an intended buffer boundary; Microsoft has not disclosed the affected routine, input structure, or trigger. An authorized local account is required, and the public record identifies no further precondition or resulting execution context.
Summary
What happened
Out-of-bounds read in Microsoft Windows Spaceport.sys allows local users to execute code on affected Windows 10, 11, and Server builds. Spaceport.sys reads beyond an intended buffer boundary; Microsoft has not disclosed the affected routine, input structure, or trigger. An authorized local account is required, and the public record identifies no further precondition or resulting execution context.
The record
- CVE
- CVE-2026-69538
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 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 <10.0.17763.9245
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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