{"id":"CVE-2026-112281","kind":"vulnerability","aliases":["CVE-2026-112281"],"related":[],"title":"libaribb24: stack overflow in CSI parsing lets crafted captions corrupt memory","description":"libaribb24 (aribb24) through 1.0.3 contains a stack-based buffer overflow vulnerability in decoder_handle_csi() in src/decoder.c that allows attackers to write past a fixed 256-entry array by supplying unbounded CSI parameter bytes. Attackers can embed a caption statement with a CSI introducer and over 256 parameter bytes in media files or broadcast streams to crash FFmpeg or VLC or corrupt the return address.","summary":"libaribb24, an ARIB caption decoder library, has a stack buffer overflow in decoder_handle_csi() when a caption contains more than 256 CSI parameter bytes. An attacker who gets a crafted media file or broadcast stream played can crash FFmpeg or VLC or potentially corrupt the return address to run code.","severity":"medium","cvss":6.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ffmpeg","libaribb24","media-processing","package","vlc"],"not_affected_if":["no-arib-captions","no-libaribb24-installed"],"how_to_check":"- Run `pkg-config --modversion aribb24` or check the installed libaribb24 package version\n- Check whether FFmpeg or VLC on the host is linked against libaribb24 (`ldd $(which ffmpeg) | grep aribb24`)","fix":"- Upgrade libaribb24 past `1.0.3` once a fixed release is published; the sources do not name a fixed version\n- Rebuild or update FFmpeg and VLC against the patched library","status":"open","published_at":"2026-10-19T14:17:06+00:00","first_seen_at":"2026-10-23T21:57:18+00:00","triaged_at":"2026-10-25T03:40:49+00:00","updated_at":"2026-10-25T03:40:49+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T03:40:49Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade libaribb24 past `1.0.3` once a fixed release is published; the sources do not name a fixed version\n- Rebuild or update FFmpeg and VLC against the patched library","reach":"internet","title":"libaribb24: stack overflow in CSI parsing lets crafted captions corrupt memory","impact":"high","summary":"libaribb24, an ARIB caption decoder library, has a stack buffer overflow in decoder_handle_csi() when a caption contains more than 256 CSI parameter bytes. An attacker who gets a crafted media file or broadcast stream played can crash FFmpeg or VLC or potentially corrupt the return address to run code.","category":"package","nicknames":[],"who_cares":["libaribb24","ffmpeg","vlc","media-processing"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker crashes the player or corrupts the return address to run code","analyst_note":"Confirm whether a fixed version of libaribb24 exists beyond 1.0.3 and check the NVD page for the CVSS vector and exploit status.","how_to_check":"- Run `pkg-config --modversion aribb24` or check the installed libaribb24 package version\n- Check whether FFmpeg or VLC on the host is linked against libaribb24 (`ldd $(which ffmpeg) | grep aribb24`)","needs_analyst":true,"not_affected_if":["no-arib-captions","no-libaribb24-installed"],"who_is_affected":"Systems that decode ARIB captions with libaribb24, typically through FFmpeg or VLC processing Japanese broadcast or media files. Exposure depends on decoding untrusted media or streams; systems that never process ARIB caption data can skip it.","user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000659,"input_tokens":3388,"output_tokens":641,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-112281':14A,17A '-2026':13A,16A '1.0.3':79C '256':46B,102C,123C 'address':72B,141C 'allow':95C 'arib':27B 'aribb24':77C 'array':104C 'attack':51B,96C,111C 'base':84C 'broadcast':59B,130C 'buffer':34B,85C 'byte':49B,110C,125C 'caption':9A,28B,42B,115C 'code':75B 'contain':43B,80C 'corrupt':10A,69B,138C 'craft':8A,55B 'crash':63B,133C 'csi':5A,39B,47B,91C,108C,119C 'cve':12A,15A 'decod':29B,37B,89C 'emb':113C 'entri':103C 'ffmpeg':18B,64B,134C 'file':57B,128C 'fix':101C 'get':53B 'handl':38B,90C 'introduc':120C 'let':7A 'libaribb24':1A,19B,25B,76C 'librari':30B 'media':21B,56B,127C 'media-process':20B 'memori':11A 'overflow':3A,35B,86C 'packag':23B 'paramet':48B,109C,124C 'pars':6A 'past':99C 'play':61B 'potenti':68B 'process':22B 'return':71B,140C 'run':74B 'src/decoder.c':93C 'stack':2A,33B,83C 'stack-bas':82C 'statement':116C 'stream':60B,131C 'suppli':106C 'unbound':107C 'vlc':24B,66B,136C 'vulner':87C 'write':98C","nicknames":[],"mitigations":[],"who_affected":"Systems that decode ARIB captions with libaribb24, typically through FFmpeg or VLC processing Japanese broadcast or media files. Exposure depends on decoding untrusted media or streams; systems that never process ARIB caption data can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-19T14:17:06+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-2026-112281","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112281","severity":null,"published_at":"2026-10-19T14:17:06+00:00","modified_at":"2026-10-19T21:14:14+00:00","first_seen_at":"2026-10-23T21:57:18+00:00","fetched_at":"2026-10-23T22:28:57+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"}