CVE-2026-30040
Received Received - Intake
Heap Overflow in FastStone Image Viewer via JPEG 2000 File

Publication date: 2026-06-26

Last updated on: 2026-06-26

Assigner: MITRE

Description
A heap overflow in the FSViewer.exe process of FastStone Image Viewer v8.3 allows attackers to cause a execute arbitrary code in the context of the current process via supplying a crafted JPEG 2000 (JP2) file.
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Meta Information
Published
2026-06-26
Last Modified
2026-06-26
Generated
2026-06-26
AI Q&A
2026-06-26
EPSS Evaluated
N/A
NVD
CVE-2026-30040
EUVD
EUVD-2026-39772
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
faststone faststone_image_viewer 8.3
Helpful Resources
Exploitability
CWE
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KEV
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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().
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Executive Summary

This vulnerability is a heap overflow in the FSViewer.exe process of FastStone Image Viewer version 8.3. It occurs when the software processes a specially crafted JPEG 2000 (JP2) file. By exploiting this flaw, an attacker can execute arbitrary code within the context of the current process.

Impact Analysis

Exploitation of this vulnerability can allow an attacker to run arbitrary code on your system with the same privileges as the FastStone Image Viewer process. This could lead to unauthorized actions such as installing malware, stealing data, or causing the application to crash.

Mitigation Strategies

To mitigate the vulnerability in FastStone Image Viewer v8.3 related to heap overflow via crafted JPEG 2000 files, immediate steps include avoiding opening untrusted or suspicious JPEG 2000 (JP2) files with the affected software.

Additionally, consider running the software under a limited local user account to reduce the impact of potential exploitation.

Since no patch or update information is provided for this specific vulnerability, restricting file downloads from untrusted sources and exercising caution when handling image files is recommended.

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