Local privilege escalation via Message Queuing heap overflow
Published Aug 11, 2026 · Updated Aug 25, 2026
Heap-based buffer overflow in Microsoft Windows Message Queuing allows local users with low privileges to elevate privileges. Microsoft has not disclosed the specific Message Queuing routine, malformed input, or allocation error that causes the heap overwrite. Exploitation requires local authenticated access; successful exploitation grants elevated control over protected data and services.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows Message Queuing allows local users with low privileges to elevate privileges. Microsoft has not disclosed the specific Message Queuing routine, malformed input, or allocation error that causes the heap overwrite. Exploitation requires local authenticated access; successful exploitation grants elevated control over protected data and services.
The record
- CVE
- CVE-2026-65790
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, T1068
- Attack vector
- local
- 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.
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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