---
id: "CVE-2026-116463"
kind: "vulnerability"
aliases: ["CVE-2026-116463"]
title: "FastStone Image Viewer: out-of-bounds read in image downsampler, remote trigger"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["faststone-image-viewer", "other", "windows"]
not_affected_if: ["unknown"]
published_at: "2026-10-26T18:17:45+00:00"
first_seen_at: "2026-10-26T18:31:44+00:00"
updated_at: "2026-10-26T18:33:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116463", "first_seen_at": "2026-10-26T18:31:44+00:00"}]
---

# FastStone Image Viewer: out-of-bounds read in image downsampler, remote trigger

FastStone Image Viewer up to version 8.5 has an out-of-bounds read in its Box-Average Downsampler component, reached through function FUN_0062d96c. The sources say an attacker can trigger it remotely by manipulating the input, which may leak memory contents.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-26T18:31:44+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116463

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_