{"id":"CVE-2026-124899","kind":"vulnerability","aliases":["CVE-2026-124899"],"related":[],"title":"Firefox: use-after-free in text layout can corrupt memory","description":"Use-after-free in the Layout: Text and Fonts 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 Layout: Text and Fonts component lets memory be reused after it is freed. The sources do not state what an attacker can do beyond that.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","firefox","runtime"],"not_affected_if":["already-on-fixed-version"],"how_to_check":"- Check the Firefox version in Help > About Firefox; the sources name Firefox 160, Firefox ESR 115.45 and Firefox ESR 153.7 as fixed versions.\n- Confirm the installed version is below the fixed release on its branch.","fix":"- Firefox `160`\n- Firefox ESR `115.45`\n- Firefox ESR `153.7`","status":"open","published_at":"2026-11-10T14:17:23+00:00","first_seen_at":"2026-11-10T14:22:16+00:00","triaged_at":"2026-11-10T14:24:53+00:00","updated_at":"2026-11-10T14:24:53+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T14:24:53Z","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 text layout can corrupt memory","impact":"high","summary":"A use-after-free bug in Firefox's Layout: Text and Fonts component lets memory be reused after it is freed. The sources do not state what an attacker can do beyond that.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browser"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown; sources do not state the impact","analyst_note":"Check the Mozilla security advisory for this CVE to learn the trigger, the attack surface and whether it is exploited.","how_to_check":"- Check the Firefox version in Help > About Firefox; the sources name Firefox 160, Firefox ESR 115.45 and Firefox ESR 153.7 as fixed versions.\n- Confirm the installed version is below the fixed release on its branch.","plain_action":"Update Firefox to version 160, or ESR 115.45 or 153.7 if you use the ESR build.","product_name":"","needs_analyst":true,"not_affected_if":["already-on-fixed-version"],"who_is_affected":"Anyone running a Firefox build older than the fixed releases on its branch. The sources do not say whether the flaw needs a particular page, setting or user action to trigger, and they do not describe the attacker's reach.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000729,"input_tokens":4492,"output_tokens":559,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124899':14A,17A '-2026':13A,16A '115.45':74C '153.7':78C '160':71C 'attack':50B 'beyond':53B 'browser':18B 'bug':26B 'compon':34B,64C 'corrupt':10A 'cve':12A,15A 'esr':73C,77C 'firefox':1A,19B,28B,70C,72C,76C 'fix':68C 'font':33B,63C 'free':5A,25B,57C 'freed':42B 'layout':8A,30B,60C 'let':35B 'memori':11A,36B 'reus':38B 'runtim':20B 'sourc':44B 'state':47B 'text':7A,31B,61C 'use':3A,23B,55C 'use-after-fre':2A,22B,54C 'vulner':66C","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox build older than the fixed releases on its branch. The sources do not say whether the flaw needs a particular page, setting or user action to trigger, and they do not describe the attacker's reach.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160, or ESR 115.45 or 153.7 if you use the ESR build.","pkeys":[],"ptokens":[],"labels":["browser","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124899':14A,17A '-2026':13A,16A 'corrupt':10A 'cve':12A,15A 'firefox':1A 'free':5A 'layout':8A 'memori':11A 'text':7A 'use':3A 'use-after-fre':2A","search_b":"'attack':50B 'beyond':53B 'browser':18B 'bug':26B 'compon':34B 'firefox':19B,28B 'font':33B 'free':25B 'freed':42B 'layout':30B 'let':35B 'memori':36B 'reus':38B 'runtim':20B 'sourc':44B 'state':47B 'text':31B 'use':23B 'use-after-fre':22B","search_c":"'115.45':74C '153.7':78C '160':71C 'compon':64C 'esr':73C,77C 'firefox':70C,72C,76C 'fix':68C 'font':63C 'free':57C 'layout':60C 'text':61C 'use':55C 'use-after-fre':54C 'vulner':66C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:23+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124899","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124899","severity":null,"published_at":"2026-11-10T14:17:23+00:00","modified_at":"2026-11-10T14:17:23+00:00","first_seen_at":"2026-11-10T14:22:16+00:00","fetched_at":"2026-11-10T14:22:16+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"}