Heap Overflow Vulnerability in FastStone Image Viewer by FastStone
CVE-2026-30040

6.5MEDIUM

Key Information:

Vendor

FastStone

Status
FastStone Image Viewer
Vendor
CVE Published:
26 June 2026

What is CVE-2026-30040?

A heap overflow vulnerability exists in the FSViewer.exe process of FastStone Image Viewer version 8.3. This flaw can be exploited by an attacker through the manipulation of specially crafted JPEG 2000 (JP2) files, allowing for the execution of arbitrary code within the context of the affected process. Proper input validation and sanitization measures are crucial to prevent potential exploitation of this vulnerability.

References

https://www.faststone.org/FSIVDownload.htm
https://kb.cert.org/vuls/id/936962

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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