What’s Vulnerable › Vulnerabilities

CVE-2026-116731: Furnace through 0.6.8.3 Out-of-Bounds Write via FamiTracker GROOVES Block Import

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-27
• Weakness: CWE-129

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 products

• tildearrow Furnace: through 0.6.8.3

References

• https://github.com/tildearrow/furnace
• https://github.com/tildearrow/furnace/blob/v0.6.8.3/src/engine/fileOps/ftm.cpp#L1597-L1605
• https://github.com/tildearrow/furnace/commit/c120c72391e3229fe258e5759f43427febcb8693
• https://github.com/tildearrow/furnace/issues/2966
• https://hackmd.io/@haindpwn/furnace-ftm-import-notemap-and-groove-subsong-oob
• https://www.vulncheck.com/advisories/furnace-through-0.6.8.3-out-of-bounds-write-via-famitracker-grooves-block-import

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