CVE-2026-101203

Received Received - Intake

Out-of-Bounds Write in FastStone Image Viewer

Publication date: 2026-09-28

Last updated on: 2026-09-28

Assigner: VulDB

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-28

Last Modified

2026-09-28

Generated

2026-09-29

AI Q&A

2026-09-29

EPSS Evaluated

N/A

NVD

CVE-2026-101203

Affected Vendors & Products

Vendor	Product	Version / Range
faststone	faststone_image_viewer	to 8.3 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds write issue in FastStone Image Viewer up to version 8.3. It exists in the 1bpp RLE Decoder component, where an unknown function can be manipulated to cause memory corruption. The attack can be launched remotely, and the vendor did not respond to early disclosure attempts.

Detection Guidance

This vulnerability involves an out-of-bounds write in FastStone Image Viewer up to version 8.3. Detection may involve checking installed versions of the software and monitoring for unusual file processing activities. No specific commands are provided in the available context.

Impact Analysis

An attacker could exploit this to execute arbitrary code or crash the application. Since the attack is remote, users opening malicious files could be affected. The impact depends on user privileges, but potential data loss or system compromise is possible.

Compliance Impact

The vulnerability involves an out-of-bounds write in FastStone Image Viewer, which could potentially allow remote attackers to execute arbitrary code or cause denial-of-service conditions. This type of vulnerability may impact compliance with GDPR or HIPAA if exploited to access, modify, or exfiltrate sensitive personal or health data. However, specific compliance impacts depend on the system's configuration and data processing context.

Mitigation Strategies

Immediately upgrade FastStone Image Viewer to the latest version beyond 8.3 if available. If no update is available, consider discontinuing use of the software until a patch is released. Monitor vendor communications for updates.

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