Local code execution via numeric truncation
Published Jul 14, 2026 · Updated Jul 14, 2026
Numeric truncation in Microsoft Windows ReFS allows local users with low privileges to execute code on affected Windows systems. Microsoft identifies ReFS as the affected component and numeric truncation as the root cause, but has not disclosed the narrowed value, code path, or attacker-controlled input. Exploitation requires local access and low privileges, needs no user interaction, and can compromise confidentiality, integrity, and availability.
Summary
What happened
Numeric truncation in Microsoft Windows ReFS allows local users with low privileges to execute code on affected Windows systems. Microsoft identifies ReFS as the affected component and numeric truncation as the root cause, but has not disclosed the narrowed value, code path, or attacker-controlled input. Exploitation requires local access and low privileges, needs no user interaction, and can compromise confidentiality, integrity, and availability.
The record
- CVE
- CVE-2026-49792
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
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
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo