CVE-2026-88173
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Use After Free in Windows BITS Allows Remote Code Execution
Vulnerability report for CVE-2026-88173, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-13
Last updated on: 2026-10-13
Assigner: Microsoft Corporation
Description
Description
Use after free in Windows Background Intelligent Transfer Service (BITS) allows an unauthorized attacker to execute code over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Microsoft | Windows | 10 Version 1607 10.0.14393.0 |
| Microsoft | Windows | 10 Version 1809 10.0.17763.0 |
| Microsoft | Windows | Server 2012 6.2.9200.0 |
| Microsoft | Windows | Server 2012 (Server Core installation) 6.2.9200.0 |
| Microsoft | Windows | Server 2012 R2 6.3.9600.0 |
| Microsoft | Windows | Server 2012 R2 (Server Core installation) 6.3.9600.0 |
| Microsoft | Windows | Server 2016 10.0.14393.0 |
| Microsoft | Windows | Server 2016 (Server Core installation) 10.0.14393.0 |
| Microsoft | Windows | Server 2019 10.0.17763.0 |
| Microsoft | Windows | Server 2019 (Server Core installation) 10.0.17763.0 |
| Microsoft | Windows | Server 2022 10.0.20348.0 |
| Microsoft | Windows | Server 2025 10.0.26100.0 |
| Microsoft | Windows | Server 2025 (Server Core installation) 10.0.26100.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-367 | The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. |
| CWE-416 | The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
