CVE-2026-70112

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Heap-based Buffer Overflow in Windows Spaceport.sys

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows Spaceport.sys allows an authorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70112

EUVD

EUVD-2026-100120

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
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-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in Windows Spaceport.sys. It allows an authorized attacker to execute code locally by exploiting a flaw that overwrites memory in the heap region.

Impact Analysis

An attacker could exploit this to run malicious code on your system with the same privileges as the vulnerable component. This could lead to data theft, system compromise, or further network infiltration if combined with other exploits.

Compliance Impact

This vulnerability allows local code execution via heap-based buffer overflow in Windows Spaceport.sys. Such unauthorized code execution could lead to data breaches, unauthorized access, or data manipulation, which may violate GDPR's integrity and confidentiality requirements and HIPAA's security rule for protecting sensitive health information.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the heap-based buffer overflow in Spaceport.sys. Monitor Microsoft's update guide for the specific patch release.

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