Vulnerability in Tildearrow Furnace
CVE-2026-116731
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.
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/tildearrow/furnace/issues/2966 (issue-tracking)
- github.com/tildearrow/furnace (product)
- github.com/tildearrow/furnace/commit/c120c72391e3229fe258e5759f43427febcb8693 (patch)
- github.com/tildearrow/furnace/blob/v0.6.8.3/src/engine/fileOps/ftm.cpp (technical-description)
- hackmd.io/@haindpwn/furnace-ftm-import-notemap-and-groove-subsong-oob (third-party-advisory)
- www.vulncheck.com/advisories/furnace-through-0.6.8.3-out-of-bounds-write-via-fa… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116731?
- CVE-2026-116731 is a medium-severity vulnerability in Tildearrow Furnace, classified under Improper Validation of Array Index. CVSS score: 6.1/10. Published 2026-10-26.
- How severe is CVE-2026-116731?
- Medium severity. CVSS v3 base score is 6.1 out of 10.