CVE-2026-56649: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1607
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Network File System allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-56649) involves a race condition (CWE-362) in the Windows Network File System on Windows 10 Version 1607 (build 10.0.14393.0). Improper synchronization during concurrent execution of shared resources can be exploited by an unauthorized attacker remotely to execute code. The vulnerability is rated medium severity with a CVSS 3.1 base score of 5.9, reflecting network attack vector, high attack complexity, no privileges required, and no user interaction. Microsoft has released an official fix to remediate this issue.
Potential Impact
An attacker who successfully exploits this vulnerability can execute code remotely on the affected system without requiring privileges or user interaction. This could lead to denial of service or potentially other impacts depending on the code executed. However, the vulnerability does not impact confidentiality or integrity directly according to the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56649 to remediate this vulnerability.
CVE-2026-56649: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1607
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Network File System allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 5.9medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-56649) involves a race condition (CWE-362) in the Windows Network File System on Windows 10 Version 1607 (build 10.0.14393.0). Improper synchronization during concurrent execution of shared resources can be exploited by an unauthorized attacker remotely to execute code. The vulnerability is rated medium severity with a CVSS 3.1 base score of 5.9, reflecting network attack vector, high attack complexity, no privileges required, and no user interaction. Microsoft has released an official fix to remediate this issue.
Potential Impact
An attacker who successfully exploits this vulnerability can execute code remotely on the affected system without requiring privileges or user interaction. This could lead to denial of service or potentially other impacts depending on the code executed. However, the vulnerability does not impact confidentiality or integrity directly according to the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56649 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-22T15:17:38.796Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56649","vendor":"Microsoft"}]
Threat ID: 6a5676bc68715ace43f0af6d
Added to database: 07/14/2026, 17:49:48 UTC
Last enriched: 08/13/2026, 15:52:33 UTC
Last updated: 08/26/2026, 22:52:11 UTC
Views: 53
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