{"id":"CVE-2026-124030","kind":"vulnerability","aliases":["CVE-2026-124030"],"related":[],"title":"GPAC: crafted XMT file crashes MP4Box via type confusion","description":"GPAC through 26.07.0 contains a type confusion vulnerability in gf_sg_command_apply() in src/scenegraph/commands.c that fails to verify BIFS field-replace command types match target node fields. Attackers can supply a crafted XMT file opened with MP4Box, such as via chapter import, causing gf_sg_vrml_field_clone() to memcpy from invalid pointers and crash.","summary":"GPAC through 26.07.0 fails to check BIFS field-replace command types in gf_sg_command_apply(), so a crafted XMT file causes a type confusion. Opening the file in MP4Box, for example through chapter import, makes the tool memcpy from invalid pointers and crash.","severity":"medium","cvss":6.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["gpac","media-processing","mp4box","package"],"not_affected_if":["no-untrusted-xmt-input"],"how_to_check":"- Check the installed GPAC version with `MP4Box -version` and compare it against the affected range through 26.07.0.","fix":null,"status":"open","published_at":"2026-11-06T20:17:21+00:00","first_seen_at":"2026-11-06T20:43:59+00:00","triaged_at":"2026-11-06T20:44:14+00:00","updated_at":"2026-11-06T20:44:14+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-06T20:44:14Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"GPAC: crafted XMT file crashes MP4Box via type confusion","impact":"low","summary":"GPAC through 26.07.0 fails to check BIFS field-replace command types in gf_sg_command_apply(), so a crafted XMT file causes a type confusion. Opening the file in MP4Box, for example through chapter import, makes the tool memcpy from invalid pointers and crash.","audience":"developers","category":"package","nicknames":[],"who_cares":["gpac","mp4box","media-processing"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"MP4Box crashes while processing a crafted XMT file","analyst_note":"Confirm the fixed version and whether the patch at github.com (linked fix) covers 26.07.0; the sources give only the affected range.","how_to_check":"- Check the installed GPAC version with `MP4Box -version` and compare it against the affected range through 26.07.0.\n- unknown for other checks; the sources do not say which settings or workflows are exposed.","plain_action":"","needs_analyst":true,"not_affected_if":["no-untrusted-xmt-input"],"who_is_affected":"Teams that run MP4Box or GPAC tools on untrusted XMT input, for example in media pipelines that import chapters from user-supplied files. Installations that never open XMT files from outside sources have a much smaller exposure. The sources do not name a fixed version beyond the affected range.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000708,"input_tokens":4308,"output_tokens":554,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-124030':12A,15A '-2026':11A,14A '26.07.0':24B,69C 'appli':38B,79C 'attack':96C 'bif':28B,86C 'caus':44B,111C 'chapter':56B,109C 'check':27B 'clone':116C 'command':32B,37B,78C,90C 'confus':9A,47B,73C 'contain':70C 'craft':2A,41B,100C 'crash':5A,66B,123C 'cve':10A,13A 'exampl':54B 'fail':25B,83C 'field':30B,88C,95C,115C 'field-replac':29B,87C 'file':4A,43B,50B,102C 'gf':35B,76C,112C 'gpac':1A,16B,22B,67C 'import':57B,110C 'invalid':63B,120C 'make':58B 'match':92C 'media':18B 'media-process':17B 'memcpi':61B,118C 'mp4box':6A,20B,52B,105C 'node':94C 'open':48B,103C 'packag':21B 'pointer':64B,121C 'process':19B 'replac':31B,89C 'sg':36B,77C,113C 'src/scenegraph/commands.c':81C 'suppli':98C 'target':93C 'tool':60B 'type':8A,33B,46B,72C,91C 'verifi':85C 'via':7A,108C 'vrml':114C 'vulner':74C 'xmt':3A,42B,101C","nicknames":[],"mitigations":[],"who_affected":"Teams that run MP4Box or GPAC tools on untrusted XMT input, for example in media pipelines that import chapters from user-supplied files. Installations that never open XMT files from outside sources have a much smaller exposure. The sources do not name a fixed version beyond the affected range.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["gpac","mediaprocessing","medium","mp4box","package"],"campaign_type":null,"search_a":"'-124030':12A,15A '-2026':11A,14A 'confus':9A 'craft':2A 'crash':5A 'cve':10A,13A 'file':4A 'gpac':1A 'mp4box':6A 'type':8A 'via':7A 'xmt':3A","search_b":"'26.07.0':24B 'appli':38B 'bif':28B 'caus':44B 'chapter':56B 'check':27B 'command':32B,37B 'confus':47B 'craft':41B 'crash':66B 'exampl':54B 'fail':25B 'field':30B 'field-replac':29B 'file':43B,50B 'gf':35B 'gpac':16B,22B 'import':57B 'invalid':63B 'make':58B 'media':18B 'media-process':17B 'memcpi':61B 'mp4box':20B,52B 'open':48B 'packag':21B 'pointer':64B 'process':19B 'replac':31B 'sg':36B 'tool':60B 'type':33B,46B 'xmt':42B","search_c":"'26.07.0':69C 'appli':79C 'attack':96C 'bif':86C 'caus':111C 'chapter':109C 'clone':116C 'command':78C,90C 'confus':73C 'contain':70C 'craft':100C 'crash':123C 'fail':83C 'field':88C,95C,115C 'field-replac':87C 'file':102C 'gf':76C,112C 'gpac':67C 'import':110C 'invalid':120C 'match':92C 'memcpi':118C 'mp4box':105C 'node':94C 'open':103C 'pointer':121C 'replac':89C 'sg':77C,113C 'src/scenegraph/commands.c':81C 'suppli':98C 'target':93C 'type':72C,91C 'verifi':85C 'via':108C 'vrml':114C 'vulner':74C 'xmt':101C","first_public_at":"2026-11-06T20:17:21+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/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-2026-124030","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124030","severity":null,"published_at":"2026-11-06T20:17:21+00:00","modified_at":"2026-11-06T20:17:21+00:00","first_seen_at":"2026-11-06T20:43:59+00:00","fetched_at":"2026-11-06T20:43:59+00:00","note":null}],"documents":[{"id":89783,"url":"https://github.com/gpac/gpac/commit/1359c4da9329cedceeb8fcfeab6d97e0927236e1","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":89784,"url":"https://www.vulncheck.com/advisories/gpac-through-26.07.0-type-confusion-via-gf-sg-command-apply-xmt-field-replace","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}