Heap-based Buffer Overflow in Microsoft JScript

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Microsoft JScript allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-69325

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	jscript	*

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 in Microsoft JScript. It allows an unauthorized attacker to execute arbitrary code remotely over a network without needing special access or 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. It poses a high risk due to remote execution capability.

Mitigation Strategies

Apply Microsoft security updates immediately to patch the JScript heap-based buffer overflow vulnerability. Disable or restrict JScript execution in browsers and applications if updates are not immediately available. Monitor network traffic for unusual activity and block suspicious connections.

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