{"id":"CVE-2026-125200","kind":"vulnerability","aliases":["CVE-2026-125200"],"related":[],"title":"FFmpeg: crafted Dolby Vision files leak memory during x265 transcoding","description":"FFmpeg through 9.0.2 contains a memory leak vulnerability in libavcodec/libx265.c because libx265_encode_frame() never frees the rpu.payload allocated by ff_dovi_rpu_generate(). Attackers can supply crafted Dolby Vision HEVC or AV1 files that leak one RPU allocation per encoded frame during libx265 transcoding, causing unbounded memory growth and denial of service.","summary":"FFmpeg's libx265 encoder never frees a Dolby Vision RPU buffer for each encoded frame. A crafted Dolby Vision HEVC or AV1 file makes memory grow without limit, which can exhaust the machine and cause a denial of service.","severity":"medium","cvss":6.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ffmpeg","libx265","media-transcoding","package"],"not_affected_if":["no-libx265","trusted-input-only"],"how_to_check":"- Check the installed FFmpeg version with `ffmpeg -version`, and compare it against the fixed release in the product ranges (unknown in the sources).\n- Look for services or pipelines that run FFmpeg with libx265 to transcode user-supplied media.","fix":null,"status":"open","published_at":"2026-11-09T19:16:56+00:00","first_seen_at":"2026-11-09T19:28:18+00:00","triaged_at":"2026-11-09T19:31:29+00:00","updated_at":"2026-11-09T19:31:29+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-09T19:31:29Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"unknown","title":"FFmpeg: crafted Dolby Vision files leak memory during x265 transcoding","impact":"low","summary":"FFmpeg's libx265 encoder never frees a Dolby Vision RPU buffer for each encoded frame. A crafted Dolby Vision HEVC or AV1 file makes memory grow without limit, which can exhaust the machine and cause a denial of service.","audience":"businesses","category":"package","nicknames":[],"who_cares":["ffmpeg","libx265","media-transcoding"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"Crafted media files exhaust memory and crash the transcoding service.","analyst_note":"","how_to_check":"- Check the installed FFmpeg version with `ffmpeg -version`, and compare it against the fixed release in the product ranges (unknown in the sources).\n- Look for services or pipelines that run FFmpeg with libx265 to transcode user-supplied media.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["trusted-input-only","no-libx265"],"who_is_affected":"Systems that run FFmpeg with libx265 to transcode media files, especially where users or external sources supply the files. Local one-off conversions of trusted files carry little exposure. unknown for the exact affected builds beyond 'through 9.0.2'.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000727,"input_tokens":4647,"output_tokens":524,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-125200':13A,16A '-2026':12A,15A '9.0.2':64C 'alloc':80C,100C 'attack':86C 'av1':44B,94C 'buffer':33B 'caus':57B,107C 'contain':65C 'craft':2A,39B,89C 'cve':11A,14A 'denial':59B,112C 'dolbi':3A,30B,40B,90C 'dovi':83C 'encod':26B,36B,74C,102C 'exhaust':53B 'ff':82C 'ffmpeg':1A,17B,23B,62C 'file':5A,45B,95C 'frame':37B,75C,103C 'free':28B,77C 'generat':85C 'grow':48B 'growth':110C 'hevc':42B,92C 'leak':6A,68C,97C 'libavcodec/libx265.c':71C 'libx265':18B,25B,73C,105C 'limit':50B 'machin':55B 'make':46B 'media':20B 'media-transcod':19B 'memori':7A,47B,67C,109C 'never':27B,76C 'one':98C 'packag':22B 'per':101C 'rpu':32B,84C,99C 'rpu.payload':79C 'servic':61B,114C 'suppli':88C 'transcod':10A,21B,106C 'unbound':108C 'vision':4A,31B,41B,91C 'vulner':69C 'without':49B 'x265':9A","nicknames":[],"mitigations":[],"who_affected":"Systems that run FFmpeg with libx265 to transcode media files, especially where users or external sources supply the files. Local one-off conversions of trusted files carry little exposure. unknown for the exact affected builds beyond 'through 9.0.2'.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["ffmpeg","libx265","mediatranscoding","medium","package"],"campaign_type":null,"search_a":"'-125200':13A,16A '-2026':12A,15A 'craft':2A 'cve':11A,14A 'dolbi':3A 'ffmpeg':1A 'file':5A 'leak':6A 'memori':7A 'transcod':10A 'vision':4A 'x265':9A","search_b":"'av1':44B 'buffer':33B 'caus':57B 'craft':39B 'denial':59B 'dolbi':30B,40B 'encod':26B,36B 'exhaust':53B 'ffmpeg':17B,23B 'file':45B 'frame':37B 'free':28B 'grow':48B 'hevc':42B 'libx265':18B,25B 'limit':50B 'machin':55B 'make':46B 'media':20B 'media-transcod':19B 'memori':47B 'never':27B 'packag':22B 'rpu':32B 'servic':61B 'transcod':21B 'vision':31B,41B 'without':49B","search_c":"'9.0.2':64C 'alloc':80C,100C 'attack':86C 'av1':94C 'caus':107C 'contain':65C 'craft':89C 'denial':112C 'dolbi':90C 'dovi':83C 'encod':74C,102C 'ff':82C 'ffmpeg':62C 'file':95C 'frame':75C,103C 'free':77C 'generat':85C 'growth':110C 'hevc':92C 'leak':68C,97C 'libavcodec/libx265.c':71C 'libx265':73C,105C 'memori':67C,109C 'never':76C 'one':98C 'per':101C 'rpu':84C,99C 'rpu.payload':79C 'servic':114C 'suppli':88C 'transcod':106C 'unbound':108C 'vision':91C 'vulner':69C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-09T19:16:56+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-2026-125200","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-125200","severity":null,"published_at":"2026-11-09T19:16:56+00:00","modified_at":"2026-11-09T19:16:56+00:00","first_seen_at":"2026-11-09T19:28:18+00:00","fetched_at":"2026-11-09T19:28:18+00:00","note":null}],"documents":[{"id":109291,"url":"https://github.com/FFmpeg/FFmpeg/commit/8dc4af2bbbd0d650e299a3d327bd48c775120e11","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":109292,"url":"https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-memory-leak-via-libx265-dolby-vision-rpu-payloads","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"}