{"id":"CVE-2026-125225","kind":"vulnerability","aliases":["CVE-2026-125225"],"related":[],"title":"FFmpeg: oversized AAC packet crashes remuxing of crafted media files","description":"FFmpeg through 9.0.2 contains a NULL pointer dereference vulnerability in aac_adtstoasc_filter() that allows attackers to crash applications via oversized ADTS AAC packets. Attackers can supply a crafted file with a packet over 256 MB, overflowing the bit count so init_get_bits() fails unchecked and get_bits() crashes during MP4, Matroska, FLV or LATM remuxing.","summary":"A crafted media file with an AAC packet over 256 MB makes FFmpeg dereference a NULL pointer in aac_adtstoasc_filter() during MP4, Matroska, FLV or LATM remuxing. An attacker can crash any application that processes such a file, causing denial of service.","severity":"medium","cvss":6.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ffmpeg","media-processing","runtime"],"not_affected_if":["trusted-input-only"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-09T19:17:00+00:00","first_seen_at":"2026-11-09T19:28:19+00:00","triaged_at":"2026-11-09T19:30:32+00:00","updated_at":"2026-11-09T19:30:32+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-09T19:30:32Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"unknown","title":"FFmpeg: oversized AAC packet crashes remuxing of crafted media files","impact":"low","summary":"A crafted media file with an AAC packet over 256 MB makes FFmpeg dereference a NULL pointer in aac_adtstoasc_filter() during MP4, Matroska, FLV or LATM remuxing. An attacker can crash any application that processes such a file, causing denial of service.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["ffmpeg","media-processing"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"application crash causing denial of service","analyst_note":"Check the linked patch and the VulnCheck advisory for the fixed FFmpeg version and whether the flaw is reachable beyond crashes.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["trusted-input-only"],"who_is_affected":"Systems that run FFmpeg, or applications embedding it, to remux MP4, Matroska, FLV or LATM files from untrusted sources can be crashed by a crafted input. Services that only process trusted media or never remux AAC audio are less exposed. The sources do not list specific fixed versions.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000708,"input_tokens":4645,"output_tokens":487,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-125225':13A,16A '-2026':12A,15A '256':31B,99C '9.0.2':67C 'aac':3A,28B,40B,75C,87C 'adt':86C 'adtstoasc':41B,76C 'allow':79C 'applic':55B,83C 'attack':51B,80C,89C 'bit':103C,108C,113C 'caus':61B 'contain':68C 'count':104C 'craft':8A,23B,93C 'crash':5A,53B,82C,114C 'cve':11A,14A 'denial':62B 'derefer':35B,72C 'fail':109C 'ffmpeg':1A,17B,34B,65C 'file':10A,25B,60B,94C 'filter':42B,77C 'flv':46B,118C 'get':107C,112C 'init':106C 'latm':48B,120C 'make':33B 'matroska':45B,117C 'mb':32B,100C 'media':9A,19B,24B 'media-process':18B 'mp4':44B,116C 'null':37B,70C 'overflow':101C 'overs':2A,85C 'packet':4A,29B,88C,97C 'pointer':38B,71C 'process':20B,57B 'remux':6A,49B,121C 'runtim':21B 'servic':64B 'suppli':91C 'uncheck':110C 'via':84C 'vulner':73C","nicknames":[],"mitigations":[],"who_affected":"Systems that run FFmpeg, or applications embedding it, to remux MP4, Matroska, FLV or LATM files from untrusted sources can be crashed by a crafted input. Services that only process trusted media or never remux AAC audio are less exposed. The sources do not list specific fixed versions.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["ffmpeg","mediaprocessing","medium","runtime"],"campaign_type":null,"search_a":"'-125225':13A,16A '-2026':12A,15A 'aac':3A 'craft':8A 'crash':5A 'cve':11A,14A 'ffmpeg':1A 'file':10A 'media':9A 'overs':2A 'packet':4A 'remux':6A","search_b":"'256':31B 'aac':28B,40B 'adtstoasc':41B 'applic':55B 'attack':51B 'caus':61B 'craft':23B 'crash':53B 'denial':62B 'derefer':35B 'ffmpeg':17B,34B 'file':25B,60B 'filter':42B 'flv':46B 'latm':48B 'make':33B 'matroska':45B 'mb':32B 'media':19B,24B 'media-process':18B 'mp4':44B 'null':37B 'packet':29B 'pointer':38B 'process':20B,57B 'remux':49B 'runtim':21B 'servic':64B","search_c":"'256':99C '9.0.2':67C 'aac':75C,87C 'adt':86C 'adtstoasc':76C 'allow':79C 'applic':83C 'attack':80C,89C 'bit':103C,108C,113C 'contain':68C 'count':104C 'craft':93C 'crash':82C,114C 'derefer':72C 'fail':109C 'ffmpeg':65C 'file':94C 'filter':77C 'flv':118C 'get':107C,112C 'init':106C 'latm':120C 'matroska':117C 'mb':100C 'mp4':116C 'null':70C 'overflow':101C 'overs':85C 'packet':88C,97C 'pointer':71C 'remux':121C 'suppli':91C 'uncheck':110C 'via':84C 'vulner':73C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-09T19:17:00+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-2026-125225","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-125225","severity":null,"published_at":"2026-11-09T19:17:00+00:00","modified_at":"2026-11-09T19:17:00+00:00","first_seen_at":"2026-11-09T19:28:19+00:00","fetched_at":"2026-11-09T19:28:19+00:00","note":null}],"documents":[{"id":109340,"url":"https://github.com/FFmpeg/FFmpeg/commit/3b1cbb5e0f66b85d15f1d3527436520b3f4711ec","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":109341,"url":"https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-null-pointer-dereference-via-aac-adtstoasc-bitstream-filter","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"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}