Local privilege escalation via numeric truncation
Published Jul 14, 2026 · Updated Jul 14, 2026
Heap-based buffer overflow in Microsoft Windows Network File System allows local users with low privileges to elevate privileges. Microsoft identifies a numeric truncation error leading to heap corruption but has not disclosed the affected NFS routine or malformed value. Successful exploitation requires local authorization and grants elevated control over the affected Windows system.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows Network File System allows local users with low privileges to elevate privileges. Microsoft identifies a numeric truncation error leading to heap corruption but has not disclosed the affected NFS routine or malformed value. Successful exploitation requires local authorization and grants elevated control over the affected Windows system.
The record
- CVE
- CVE-2026-56650
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, CWE-197, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 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 <10.0.17763.9020
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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