Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck
CVE-2026-116731Furnace through 0.6.8.3 Out-of-Bounds Write via FamiTracker GROOVES Block Import
Medium 6.1
In plain English
A medium-severity security flaw in furnace from tildearrow. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.1%top 96.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | furnace | no fix listed | DEBIAN-CVE-2026-116731 |
| Debian:14 | furnace | no fix listed | DEBIAN-CVE-2026-116731 |
| Ubuntu:26.04:LTS | furnace | no fix listed | UBUNTU-CVE-2026-116731 |
| Ubuntu:26.10 | furnace | no fix listed | UBUNTU-CVE-2026-116731 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tildearrow | furnace | 0 – through 0.6.8.3 |
Weakness: CWE-129 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
References
- GitHub Issue #2966 issue-tracking
- https://github.com/tildearrow/furnace product
- https://github.com/tildearrow/furnace/commit/c120c72391e3229fe258e5759f43427febcb8693 patch
- https://github.com/tildearrow/furnace/blob/v0.6.8.3/src/engine/fileOps/ftm.cpp#L1597-L1605 technical-description
- https://hackmd.io/@haindpwn/furnace-ftm-import-notemap-and-groove-subsong-oob third-party-advisory
- VulnCheck Advisory: Furnace through 0.6.8.3 Out-of-Bounds Write via FamiTracker GROOVES Block Import third-party-advisory