---
id: "CVE-2026-116730"
kind: "vulnerability"
aliases: ["CVE-2026-116730"]
title: "Furnace: crafted FamiTracker module reads past heap buffer on import"
severity: "medium"
cvss: 6.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["desktop", "furnace", "music-production", "package"]
not_affected_if: ["newer-version", "no-ftm-import"]
published_at: "2026-10-26T22:16:56+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-2026-116730", "first_seen_at": "2026-10-26T22:25:33+00:00"}]
---

# Furnace: crafted FamiTracker module reads past heap buffer on import

Furnace, a chiptune tracker, has an out-of-bounds heap read in its FamiTracker module loader when a 2A03 instrument declares more than 120 notes. An attacker who gets a user to open a crafted .ftm, .dnm or 0CC/E-FamiTracker file can crash Furnace.

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

## How to check

- Run `furnace --version` or check the installed Furnace version in the app's About dialog.
- Check whether the installed version is `0.6.8.3` or earlier.

## Fix

- Move Furnace to a release newer than `0.6.8.3` once the upstream fix is published (unknown from the sources).
- Until then, only open FamiTracker modules from trusted sources.

## Timeline

- 2026-10-26T22:25:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116730

## From the sources

Furnace through 0.6.8.3 contains an out-of-bounds heap read vulnerability in DivEngine::loadFTM() in src/engine/fileOps/ftm.cpp, triggered by an unbounded DPCM note count during FamiTracker module import. Attackers can craft a .ftm, .dnm or 0CC/E-FamiTracker module with a 2A03 instrument note count above 120 to read past the noteMap array and crash Furnace when opened.

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