{"id":"CVE-2026-124860","kind":"vulnerability","aliases":["CVE-2026-124860"],"related":[],"title":"Firefox: use-after-free in Audio/Video lets attackers run code","description":"Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.","summary":"Firefox has a use-after-free bug in its Audio/Video component, where memory is used after it has been freed. The sources do not state what an attacker gets beyond that, so impact is unconfirmed.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["already-on-fixed-version"],"how_to_check":"- Check the installed Firefox version in the browser's About page or with `firefox --version`\n- Compare it against the fixed versions: Firefox `160`, Firefox ESR `115.45`, Firefox ESR `153.7`","fix":"- Firefox: `160` or later\n- Firefox ESR 115 branch: `115.45` or later\n- Firefox ESR 153 branch: `153.7` or later","status":"open","published_at":"2026-11-10T14:17:18+00:00","first_seen_at":"2026-11-10T14:22:13+00:00","triaged_at":"2026-11-10T14:26:36+00:00","updated_at":"2026-11-10T14:26:36+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T14:26:36Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: `160` or later\n- Firefox ESR 115 branch: `115.45` or later\n- Firefox ESR 153 branch: `153.7` or later","reach":"unknown","title":"Firefox: use-after-free in Audio/Video lets attackers run code","impact":"high","summary":"Firefox has a use-after-free bug in its Audio/Video component, where memory is used after it has been freed. The sources do not state what an attacker gets beyond that, so impact is unconfirmed.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browsers","desktop"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown; sources do not describe the attacker's gain","analyst_note":"Check the Mozilla security advisory for CVE-2026-124860 to confirm trigger conditions, user interaction and exploit impact; NVD text alone gives no severity.","how_to_check":"- Check the installed Firefox version in the browser's About page or with `firefox --version`\n- Compare it against the fixed versions: Firefox `160`, Firefox ESR `115.45`, Firefox ESR `153.7`","plain_action":"Update Firefox to version 160, or the ESR version 115.45 or 153.7 if you use ESR, through Firefox's update menu.","product_name":"","needs_analyst":true,"not_affected_if":["already-on-fixed-version"],"who_is_affected":"Anyone running a Firefox build older than the fixed versions is exposed, since the flaw is in the browser's own Audio/Video code. Sources do not say whether web content alone triggers it or whether a specific media setting is required. Teams that manage browsers should check the Firefox versions on their machines.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.00077,"input_tokens":4482,"output_tokens":644,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124860':14A,17A '-2026':13A,16A '115.45':75C '153.7':79C '160':72C 'attack':9A,50B 'audio/video':7A,32B,64C 'beyond':52B 'browser':18B 'bug':29B 'code':11A 'compon':33B,65C 'cve':12A,15A 'desktop':19B 'esr':74C,78C 'firefox':1A,20B,22B,71C,73C,77C 'fix':69C 'free':5A,28B,61C 'freed':42B 'get':51B 'impact':55B 'let':8A 'memori':35B 'run':10A 'runtim':21B 'sourc':44B 'state':47B 'unconfirm':57B 'use':3A,26B,37B,59C 'use-after-fre':2A,25B,58C 'vulner':67C","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox build older than the fixed versions is exposed, since the flaw is in the browser's own Audio/Video code. Sources do not say whether web content alone triggers it or whether a specific media setting is required. Teams that manage browsers should check the Firefox versions on their machines.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160, or the ESR version 115.45 or 153.7 if you use ESR, through Firefox's update menu.","pkeys":[],"ptokens":[],"labels":["browsers","desktop","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124860':14A,17A '-2026':13A,16A 'attack':9A 'audio/video':7A 'code':11A 'cve':12A,15A 'firefox':1A 'free':5A 'let':8A 'run':10A 'use':3A 'use-after-fre':2A","search_b":"'attack':50B 'audio/video':32B 'beyond':52B 'browser':18B 'bug':29B 'compon':33B 'desktop':19B 'firefox':20B,22B 'free':28B 'freed':42B 'get':51B 'impact':55B 'memori':35B 'runtim':21B 'sourc':44B 'state':47B 'unconfirm':57B 'use':26B,37B 'use-after-fre':25B","search_c":"'115.45':75C '153.7':79C '160':72C 'audio/video':64C 'compon':65C 'esr':74C,78C 'firefox':71C,73C,77C 'fix':69C 'free':61C 'use':59C 'use-after-fre':58C 'vulner':67C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:18+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124860","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124860","severity":null,"published_at":"2026-11-10T14:17:18+00:00","modified_at":"2026-11-10T14:17:18+00:00","first_seen_at":"2026-11-10T14:22:13+00:00","fetched_at":"2026-11-10T14:22:13+00:00","note":null}],"documents":[],"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"}