{"id":"CVE-2026-125231","kind":"vulnerability","aliases":["CVE-2026-125231"],"related":[],"title":"FFmpeg: crafted ADX audio stream crashes applications via NULL pointer dereference","description":"FFmpeg 4.4 through 9.0.2 contains a NULL pointer dereference vulnerability in libavcodec/adxdec.c because adx_decode_header() updates the channel layout before validating the sample rate. Attackers can supply a crafted ADX/AAX stream with mid-stream new-extradata side data carrying an invalid sample rate, causing adx_decode() to write through NULL plane pointers and crash the application.","summary":"FFmpeg's ADX/AAX decoder in libavcodec/adxdec.c updates the channel layout before validating the sample rate. A crafted stream with an invalid sample rate in mid-stream extradata makes the decoder write through NULL pointers, crashing the application.","severity":"medium","cvss":6.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ffmpeg","libavcodec","media-processing","package"],"not_affected_if":["no-untrusted-adx-input","versions-outside-4.4-9.0.2"],"how_to_check":"- Check the FFmpeg version with `ffmpeg -version`, and whether it falls in 4.4 through 9.0.2.\n- Check whether your application decodes untrusted ADX or AAX audio files or streams.","fix":"- FFmpeg 4.4 through 9.0.2 are affected; the sources do not name a fixed version beyond the linked patch.","status":"open","published_at":"2026-11-09T19:17:00+00:00","first_seen_at":"2026-11-09T19:28:20+00:00","triaged_at":"2026-11-09T19:30:29+00:00","updated_at":"2026-11-09T19:30:29+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-09T19:30:29Z","model":"claude-haiku-5-5","output":{"fix":"- FFmpeg 4.4 through 9.0.2 are affected; the sources do not name a fixed version beyond the linked patch.","reach":"unknown","title":"FFmpeg: crafted ADX audio stream crashes applications via NULL pointer dereference","impact":"low","summary":"FFmpeg's ADX/AAX decoder in libavcodec/adxdec.c updates the channel layout before validating the sample rate. A crafted stream with an invalid sample rate in mid-stream extradata makes the decoder write through NULL pointers, crashing the application.","audience":"developers","category":"package","nicknames":[],"who_cares":["ffmpeg","libavcodec","media-processing"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Application crashes while decoding a crafted ADX stream.","analyst_note":"Confirm the fixed version and patch details from the linked GitHub patch and the VulnCheck advisory; the sources do not state a fixed version.","how_to_check":"- Check the FFmpeg version with `ffmpeg -version`, and whether it falls in 4.4 through 9.0.2.\n- Check whether your application decodes untrusted ADX or AAX audio files or streams.","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["versions-outside-4.4-9.0.2","no-untrusted-adx-input"],"who_is_affected":"Applications that link FFmpeg's libavcodec and decode ADX or AAX audio from untrusted sources are exposed. Systems that only decode trusted local media, or that do not use the ADX/AAX decoder, can skip it. The sources do not say whether the crash can be escalated beyond a denial of service.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000789,"input_tokens":4645,"output_tokens":649,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-125231':14A,17A '-2026':13A,16A '4.4':63C '9.0.2':65C 'adx':3A,75C,109C 'adx/aax':26B,92C 'applic':7A,61B,120C 'attack':87C 'audio':4A 'carri':103C 'caus':108C 'channel':32B,80C 'contain':66C 'craft':2A,40B,91C 'crash':6A,59B,118C 'cve':12A,15A 'data':102C 'decod':27B,54B,76C,110C 'derefer':11A,70C 'extradata':51B,100C 'ffmpeg':1A,18B,24B,62C 'header':77C 'invalid':44B,105C 'layout':33B,81C 'libavcodec':19B 'libavcodec/adxdec.c':29B,73C 'make':52B 'media':21B 'media-process':20B 'mid':49B,96C 'mid-stream':48B,95C 'new':99C 'new-extradata':98C 'null':9A,57B,68C,114C 'packag':23B 'plane':115C 'pointer':10A,58B,69C,116C 'process':22B 'rate':38B,46B,86C,107C 'sampl':37B,45B,85C,106C 'side':101C 'stream':5A,41B,50B,93C,97C 'suppli':89C 'updat':30B,78C 'valid':35B,83C 'via':8A 'vulner':71C 'write':55B,112C","nicknames":[],"mitigations":[],"who_affected":"Applications that link FFmpeg's libavcodec and decode ADX or AAX audio from untrusted sources are exposed. Systems that only decode trusted local media, or that do not use the ADX/AAX decoder, can skip it. The sources do not say whether the crash can be escalated beyond a denial of service.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["ffmpeg","libavcodec","mediaprocessing","medium","package"],"campaign_type":null,"search_a":"'-125231':14A,17A '-2026':13A,16A 'adx':3A 'applic':7A 'audio':4A 'craft':2A 'crash':6A 'cve':12A,15A 'derefer':11A 'ffmpeg':1A 'null':9A 'pointer':10A 'stream':5A 'via':8A","search_b":"'adx/aax':26B 'applic':61B 'channel':32B 'craft':40B 'crash':59B 'decod':27B,54B 'extradata':51B 'ffmpeg':18B,24B 'invalid':44B 'layout':33B 'libavcodec':19B 'libavcodec/adxdec.c':29B 'make':52B 'media':21B 'media-process':20B 'mid':49B 'mid-stream':48B 'null':57B 'packag':23B 'pointer':58B 'process':22B 'rate':38B,46B 'sampl':37B,45B 'stream':41B,50B 'updat':30B 'valid':35B 'write':55B","search_c":"'4.4':63C '9.0.2':65C 'adx':75C,109C 'adx/aax':92C 'applic':120C 'attack':87C 'carri':103C 'caus':108C 'channel':80C 'contain':66C 'craft':91C 'crash':118C 'data':102C 'decod':76C,110C 'derefer':70C 'extradata':100C 'ffmpeg':62C 'header':77C 'invalid':105C 'layout':81C 'libavcodec/adxdec.c':73C 'mid':96C 'mid-stream':95C 'new':99C 'new-extradata':98C 'null':68C,114C 'plane':115C 'pointer':69C,116C 'rate':86C,107C 'sampl':85C,106C 'side':101C 'stream':93C,97C 'suppli':89C 'updat':78C 'valid':83C 'vulner':71C 'write':112C","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-2026-125231","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-125231","severity":null,"published_at":"2026-11-09T19:17:00+00:00","modified_at":"2026-11-09T19:17:00+00:00","first_seen_at":"2026-11-09T19:28:20+00:00","fetched_at":"2026-11-09T19:28:20+00:00","note":null}],"documents":[{"id":109352,"url":"https://github.com/FFmpeg/FFmpeg/commit/515dcad73d77711507083cae3913c9327c0977c6","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":109353,"url":"https://www.vulncheck.com/advisories/ffmpeg-4.4-through-9.0.2-null-pointer-dereference-via-adx-decode-header","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"}