CVE-2026-30040
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductImage Viewer
PublishedJun 26, 2026
First seenJun 26, 2026
Weakness typeCWE-122CWE-122
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| FastStone Image Viewer | 8.3 | — |
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