CVE-2026-105005

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Out-of-Bounds Write in Windows Schannel

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

Out-of-bounds write in Windows Schannel allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-105005

EUVD

EUVD-2026-100394

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	11 version 26H1 10.0.28000.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds write vulnerability in Windows Schannel, a component handling secure communications. It allows an unauthorized attacker to execute arbitrary code remotely over a network without needing user interaction.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your device. Since it requires no user interaction, even patched systems may be at risk if not updated.

Compliance Impact

This vulnerability allows remote code execution via an out-of-bounds write in Windows Schannel, which could lead to unauthorized access or data breaches. Such breaches may violate compliance requirements under GDPR (data protection) and HIPAA (health information security) by exposing sensitive data.

Mitigation Strategies

Apply the latest security updates from Microsoft for Windows Schannel to patch the out-of-bounds write vulnerability. Monitor Microsoft's update guide for specific patches and install them promptly.

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