---
id: "CVE-2026-116731"
kind: "vulnerability"
aliases: ["CVE-2026-116731"]
title: "Furnace tracker: crafted FamiTracker module corrupts memory, crashes on open"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["chiptune", "desktop", "furnace", "other"]
not_affected_if: ["never-opens-untrusted-ftm-files"]
published_at: "2026-10-26T22:16:57+00:00"
first_seen_at: "2026-10-26T22:25:33+00:00"
updated_at: "2026-10-26T22:27:53+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116731", "first_seen_at": "2026-10-26T22:25:33+00:00"}]
---

# Furnace tracker: crafted FamiTracker module corrupts memory, crashes on open

Furnace through 0.6.8.3 writes past a heap buffer in DivEngine::loadFTM() when a FamiTracker module declares two or more subsongs. Opening a crafted module corrupts heap memory and crashes the application.

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

## How to check

- Check the installed Furnace version and compare it with the affected range, 0.6.8.3 and earlier.

## Fix

- unknown

## Timeline

- 2026-10-26T22:25:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116731

## From the sources

Furnace through 0.6.8.3 contains an out-of-bounds write vulnerability in DivEngine::loadFTM() that allows attackers to corrupt heap memory via an unchecked subsong index in the GROOVES block. Attackers can craft a FamiTracker module with a subsong count of 2 or more to write a groove pattern past the subsong vector, crashing Furnace when opened.

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