Threat database

A vulnerability was determined in FastStone Image Viewer up to 8.3. This impacts an unknown function of the component PCX Decoder. This manipulation causes out-of-bounds read. The attack may be initiated remotely. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-101204 is an out-of-bounds read vulnerability in FastStone Image Viewer up to version 8.3, specifically in the TGA Image Handler component of FSViewer.exe. This vulnerability can be triggered remotely and may lead to information disclosure or application instability. The vendor has not responded to the disclosure, and no patch or fix is currently available. The CVSS score is 5.3, indicating a medium severity level.

CVE-2026-101203 is a medium severity vulnerability in FastStone Image Viewer up to version 8.3. It involves an out-of-bounds write in an unknown function of the 1bpp RLE Decoder component. The vulnerability can be triggered remotely and requires user interaction. No vendor response or patch is currently available.

A flaw has been found in FastStone Image Viewer up to 8.3. The affected element is an unknown function of the component TGA Image Handler. Executing a manipulation can lead to out-of-bounds write. It is possible to launch the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.

FastStone Image Viewer GIF File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FastStone Image Viewer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of GIF files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-25145.

FastStone Image Viewer TGA File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FastStone Image Viewer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of TGA files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-25140.

FastStone Image Viewer PSD File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FastStone Image Viewer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of PSD files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-25102.