{"id":"CVE-2026-116731","kind":"vulnerability","aliases":["CVE-2026-116731"],"related":[],"title":"Furnace tracker: crafted FamiTracker module corrupts memory, crashes on open","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.","summary":"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.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["chiptune","desktop","furnace","other"],"not_affected_if":["never-opens-untrusted-ftm-files"],"how_to_check":"- Check the installed Furnace version and compare it with the affected range, 0.6.8.3 and earlier.","fix":"- unknown","status":"open","published_at":"2026-10-26T22:16:57+00:00","first_seen_at":"2026-10-26T22:25:33+00:00","triaged_at":"2026-10-26T22:27:53+00:00","updated_at":"2026-10-26T22:27:53+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-26T22:27:53Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"local","title":"Furnace tracker: crafted FamiTracker module corrupts memory, crashes on open","impact":"medium","summary":"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.","category":"other","nicknames":[],"who_cares":["furnace","chiptune","desktop"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker-supplied file crashes Furnace and may corrupt heap memory.","analyst_note":"Find the first fixed Furnace release after 0.6.8.3 and check whether the sources say heap corruption can lead to code execution. Source: https://nvd.nist.gov/vuln/detail/CVE-2026-116731","how_to_check":"- Check the installed Furnace version and compare it with the affected range, 0.6.8.3 and earlier.","needs_analyst":true,"not_affected_if":["never-opens-untrusted-ftm-files"],"who_is_affected":"Anyone who opens FamiTracker (.ftm) modules in Furnace 0.6.8.3 or earlier may be affected, since the bug is triggered by loading a file with a subsong count of 2 or more. The sources do not describe a server or automated path, so teams that only use Furnace on their own music files with no untrusted input are at much lower risk.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000995,"input_tokens":3361,"output_tokens":1318,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-116731':13A,16A '-2026':12A,15A '0.6.8.3':22B,53C '2':92C 'allow':66C 'applic':50B 'attack':67C,81C 'block':80C 'bound':59C 'buffer':27B 'chiptun':17B 'contain':54C 'corrupt':6A,44B,69C 'count':90C 'craft':3A,42B,83C 'crash':8A,48B,104C 'cve':11A,14A 'declar':35B 'desktop':18B 'divengin':29B,63C 'famitrack':4A,33B,85C 'furnac':1A,19B,20B,51C,105C 'groov':79C,98C 'heap':26B,45B,70C 'index':76C 'loadftm':30B,64C 'memori':7A,46B,71C 'modul':5A,34B,43B,86C 'open':10A,40B,107C 'out-of-bound':56C 'past':24B,100C 'pattern':99C 'subsong':39B,75C,89C,102C 'tracker':2A 'two':36B 'uncheck':74C 'vector':103C 'via':72C 'vulner':61C 'write':23B,60C,96C","nicknames":[],"mitigations":[],"who_affected":"Anyone who opens FamiTracker (.ftm) modules in Furnace 0.6.8.3 or earlier may be affected, since the bug is triggered by loading a file with a subsong count of 2 or more. The sources do not describe a server or automated path, so teams that only use Furnace on their own music files with no untrusted input are at much lower risk.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T22:16:57+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-116731","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116731","severity":null,"published_at":"2026-10-26T22:16:57+00:00","modified_at":"2026-10-26T22:16:57+00:00","first_seen_at":"2026-10-26T22:25:33+00:00","fetched_at":"2026-10-26T22:25:33+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}