CVE-2026-101203

Medium

Description

A vulnerability has been found in FastStone Image Viewer up to 8.3. The impacted element is an unknown function of the component 1bpp RLE Decoder. The manipulation leads to out-of-bounds write. The attack can be initiated remotely. The vendor was contacted early about this disclosure but did not respond in any way.

SeverityMedium

CVSS6.3

Exploit probability—

ProductFaststone Image Viewer

PublishedSep 28, 2026

First seenSep 28, 2026

Weakness typeCWE-787Out-of-bounds write CWE-119Memory buffer bounds error

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

Product	Affected versions	Fixed in
faststone image_viewer	8.0, 8.1, 8.2, 8.3	—

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