---
id: CVE-2026-116463
title: FastStone Image Viewer Box-Average Downsampler FUN_0062d96c out-of-bounds
summary: >-
  A vulnerability was identified in FastStone Image Viewer up to 8.5. Affected
  is the function FUN_0062d96c of the component Box-Average Downsampler Engine.
  The manipulation leads to out-of-bounds read. It is possible to initiate the
  attac…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R'
cvssSource: cna
cwe:
  - CWE-125
  - CWE-119
vendor: FastStone
product: Image Viewer
affected:
  - image_viewer 8.0
  - image_viewer 8.1
  - image_viewer 8.2
  - image_viewer 8.3
  - image_viewer 8.4
  - image_viewer 8.5
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T18:00:15.404Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116463'
references:
  - url: 'https://vuldb.com/vuln/426360'
    label: >-
      VDB-426360 | FastStone Image Viewer Box-Average Downsampler FUN_0062d96c
      out-of-bounds
  - url: 'https://vuldb.com/vuln/426360/cti'
    label: 'VDB-426360 | CTI Indicators (IOB, IOC, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-116463'
    label: CVE-2026-116463 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1013651'
    label: 'Submit #1013651 | FastStone Image Viewer 8.5 Out-of-Bounds Read'
tags:
  - cve.org
ingestedAt: '2026-10-26T18:35:51.541Z'
epss: 0.00231
epssPercentile: 0.13909
---

## Overview

A vulnerability was identified in FastStone Image Viewer up to 8.5. Affected is the function FUN_0062d96c of the component Box-Average Downsampler Engine. The manipulation leads to out-of-bounds read. It is possible to initiate the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.

## Affected

- `image_viewer 8.0`
- `image_viewer 8.1`
- `image_viewer 8.2`
- `image_viewer 8.3`
- `image_viewer 8.4`
- `image_viewer 8.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.