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5.9 Medium

CVE-2026-56649 Windows Network File System Remote Code Execution Vulnerability

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 3.1 detail

Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
High
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected products and versions

Product Affected versions Fixed in
Windows 10 Version 1607 10.0 10.0.14393.0 → < 10.0.14393.9339 10.0.14393.9339
Windows 10 Version 1809 10.0 10.0.17763.0 → < 10.0.17763.9020 10.0.17763.9020
Windows 10 Version 21H2 10.0 10.0.19044.0 → < 10.0.19044.7548 10.0.19044.7548
Windows 10 Version 22H2 10.0 10.0.19045.0 → < 10.0.19045.7548 10.0.19045.7548
Windows 11 Version 24H2 10.0 10.0.26100.0 → < 10.0.26100.8875 10.0.26100.8875
Windows 11 Version 25H2 10.0 10.0.26200.0 → < 10.0.26200.8875 10.0.26200.8875
Windows 11 version 26H1 10.0 10.0.28000.0 → < 10.0.28000.2525 10.0.28000.2525
Windows Server 2012 6.2 6.2.9200.0 → < 6.2.9200.26226 6.2.9200.26226
Windows Server 2012 (Server Core installation) 6.2 6.2.9200.0 → < 6.2.9200.26226 6.2.9200.26226
Show the 9 other branches
Product Affected versions Fixed in
Windows Server 2012 R2 6.3 6.3.9600.0 → < 6.3.9600.23291 6.3.9600.23291
Windows Server 2012 R2 (Server Core installation) 6.3 6.3.9600.0 → < 6.3.9600.23291 6.3.9600.23291
Windows Server 2016 10.0 10.0.14393.0 → < 10.0.14393.9339 10.0.14393.9339
Windows Server 2016 (Server Core installation) 10.0 10.0.14393.0 → < 10.0.14393.9339 10.0.14393.9339
Windows Server 2019 10.0 10.0.17763.0 → < 10.0.17763.9020 10.0.17763.9020
Windows Server 2019 (Server Core installation) 10.0 10.0.17763.0 → < 10.0.17763.9020 10.0.17763.9020
Windows Server 2022 10.0 10.0.20348.0 → < 10.0.20348.5386 10.0.20348.5386
Windows Server 2025 10.0 10.0.26100.0 → < 10.0.26100.33158 10.0.26100.33158
Windows Server 2025 (Server Core installation) 10.0 10.0.26100.0 → < 10.0.26100.33158 10.0.26100.33158

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