Local privilege escalation via out-of-bounds write
Published Jun 9, 2026 · Updated Jun 9, 2026
Out-of-bounds write in Windows Hotpatch Monitoring Service allows local users with authorization to elevate privileges. Microsoft has not disclosed the affected code path or how the service writes beyond a buffer boundary. Local low-privileged access is required; successful exploitation grants elevated privileges and can compromise system confidentiality, integrity, and availability.
Summary
What happened
Out-of-bounds write in Windows Hotpatch Monitoring Service allows local users with authorization to elevate privileges. Microsoft has not disclosed the affected code path or how the service writes beyond a buffer boundary. Local low-privileged access is required; successful exploitation grants elevated privileges and can compromise system confidentiality, integrity, and availability.
The record
- CVE
- CVE-2026-42910
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 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=10.0.26100.0 <10.0.26100.32995
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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