{"id":"CVE-2026-124861","kind":"vulnerability","aliases":["CVE-2026-124861"],"related":[],"title":"Firefox: use-after-free in audio component lets sandbox be escaped","description":"Sandbox escape due to use-after-free in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.","summary":"A use-after-free bug in Firefox's Audio/Video cubeb component allows a sandbox escape. A successful attack lets malicious code get past the browser's sandbox protections.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Firefox","fixed":[],"affected":"","ecosystem":"runtime"}],"ecosystems":["runtime"],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["up-to-date-firefox"],"how_to_check":"- Check the Firefox version with `about:support` or Help > About Firefox.\n- Confirm it is below `160` on the current branch, below `153.7` on ESR 153, or below `115.45` on ESR 115.","fix":"- Firefox: `160`\n- Firefox ESR: `115.45`\n- Firefox ESR: `153.7`","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":0.6,"triage":{"at":"2026-11-10T14:26:36Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: `160`\n- Firefox ESR: `115.45`\n- Firefox ESR: `153.7`","reach":"unknown","title":"Firefox: use-after-free in audio component lets sandbox be escaped","impact":"high","summary":"A use-after-free bug in Firefox's Audio/Video cubeb component allows a sandbox escape. A successful attack lets malicious code get past the browser's sandbox protections.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","desktop","browsers"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"Malicious code escapes the browser sandbox and reaches the system.","analyst_note":"Confirm trigger conditions and whether web content alone is enough, using the Mozilla security advisory for CVE-2026-124861.","how_to_check":"- Check the Firefox version with `about:support` or Help > About Firefox.\n- Confirm it is below `160` on the current branch, below `153.7` on ESR 153, or below `115.45` on ESR 115.","plain_action":"Update Firefox to version 160, or to ESR 115.45 or ESR 153.7 if you use the extended support release.","product_name":"Firefox","needs_analyst":true,"not_affected_if":["up-to-date-firefox"],"who_is_affected":"Anyone running a Firefox build older than the fixed versions, on desktop or in environments that use Firefox for browsing. The sources do not describe the trigger in detail, so unknown whether a page visit alone is enough.","user_interaction":"unknown","product_ecosystem":"runtime","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000751,"input_tokens":4508,"output_tokens":600,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124861':15A,18A '-2026':14A,17A '115.45':75C '153.7':79C '160':72C 'allow':36B 'attack':42B 'audio':7A 'audio/video':33B,63C 'browser':20B,49B 'bug':29B 'code':45B 'compon':8A,35B,65C 'cubeb':34B,64C 'cve':13A,16A 'desktop':21B 'due':55C 'escap':12A,39B,54C 'esr':74C,78C 'firefox':1A,19A,22B,31B,71C,73C,77C 'fix':69C 'free':5A,28B,60C 'get':46B 'let':9A,43B 'malici':44B 'past':47B 'protect':52B 'runtim':23B 'sandbox':10A,38B,51B,53C 'success':41B 'use':3A,26B,58C 'use-after-fre':2A,25B,57C 'vulner':67C","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox build older than the fixed versions, on desktop or in environments that use Firefox for browsing. The sources do not describe the trigger in detail, so unknown whether a page visit alone is enough.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160, or to ESR 115.45 or ESR 153.7 if you use the extended support release.","pkeys":["firefox"],"ptokens":["firefox"],"labels":["browsers","desktop","firefox","high","runtime"],"campaign_type":null,"search_a":"'-124861':15A,18A '-2026':14A,17A 'audio':7A 'compon':8A 'cve':13A,16A 'escap':12A 'firefox':1A,19A 'free':5A 'let':9A 'sandbox':10A 'use':3A 'use-after-fre':2A","search_b":"'allow':36B 'attack':42B 'audio/video':33B 'browser':20B,49B 'bug':29B 'code':45B 'compon':35B 'cubeb':34B 'desktop':21B 'escap':39B 'firefox':22B,31B 'free':28B 'get':46B 'let':43B 'malici':44B 'past':47B 'protect':52B 'runtim':23B 'sandbox':38B,51B 'success':41B 'use':26B 'use-after-fre':25B","search_c":"'115.45':75C '153.7':79C '160':72C 'audio/video':63C 'compon':65C 'cubeb':64C 'due':55C 'escap':54C 'esr':74C,78C 'firefox':71C,73C,77C 'fix':69C 'free':60C 'sandbox':53C 'use':58C 'use-after-fre':57C '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-2026-124861","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124861","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"}