{"id":"CVE-2026-124870","kind":"vulnerability","aliases":["CVE-2026-124870"],"related":[],"title":"Firefox: JavaScript garbage collector boundary flaw, fixed in version 160","description":"Incorrect boundary conditions in the JavaScript: GC component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.","summary":"Firefox's JavaScript garbage collector has an incorrect boundary condition, which Mozilla fixed in Firefox 160 and Firefox ESR 153.7. The sources do not describe what an attacker can do with it.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","firefox","runtime"],"not_affected_if":["firefox-160-or-later","firefox-esr-153.7-or-later"],"how_to_check":"- Check the installed Firefox version in the About Firefox dialog.\n- Compare it with `160` for Firefox and `153.7` for Firefox ESR.","fix":"- Firefox `160`\n- Firefox ESR `153.7`","status":"open","published_at":"2026-11-10T14:17:19+00:00","first_seen_at":"2026-11-10T14:22:14+00:00","triaged_at":"2026-11-10T14:26:24+00:00","updated_at":"2026-11-10T14:26:24+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T14:26:24Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox `160`\n- Firefox ESR `153.7`","reach":"unknown","title":"Firefox: JavaScript garbage collector boundary flaw, fixed in version 160","impact":"medium","summary":"Firefox's JavaScript garbage collector has an incorrect boundary condition, which Mozilla fixed in Firefox 160 and Firefox ESR 153.7. The sources do not describe what an attacker can do with it.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browsers"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown","analyst_note":"Read the Mozilla advisory for CVE-2026-124870 to learn the attacker impact and whether a web page can trigger it.","how_to_check":"- Check the installed Firefox version in the About Firefox dialog.\n- Compare it with `160` for Firefox and `153.7` for Firefox ESR.","plain_action":"Update Firefox to version 160 or Firefox ESR 153.7 through the browser's update settings.","product_name":"","needs_analyst":true,"not_affected_if":["firefox-160-or-later","firefox-esr-153.7-or-later"],"who_is_affected":"Anyone running Firefox older than 160 or Firefox ESR older than 153.7 is in scope. The sources do not say whether the flaw is reachable from a web page without user interaction, or what the worst outcome is.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000723,"input_tokens":4484,"output_tokens":550,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124870':13A,16A '-2026':12A,15A '153.7':39B,66C '160':10A,35B,62C 'attack':47B 'boundari':5A,28B,49C 'browser':17B 'collector':4A,24B 'compon':55C 'condit':29B,50C 'cve':11A,14A 'describ':44B 'esr':38B,65C 'firefox':1A,18B,20B,34B,37B,61C,64C 'fix':7A,32B,59C 'flaw':6A 'garbag':3A,23B 'gc':54C 'incorrect':27B,48C 'javascript':2A,22B,53C 'mozilla':31B 'runtim':19B 'sourc':41B 'version':9A 'vulner':57C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox older than 160 or Firefox ESR older than 153.7 is in scope. The sources do not say whether the flaw is reachable from a web page without user interaction, or what the worst outcome is.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160 or Firefox ESR 153.7 through the browser's update settings.","pkeys":[],"ptokens":[],"labels":["browsers","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124870':13A,16A '-2026':12A,15A '160':10A 'boundari':5A 'collector':4A 'cve':11A,14A 'firefox':1A 'fix':7A 'flaw':6A 'garbag':3A 'javascript':2A 'version':9A","search_b":"'153.7':39B '160':35B 'attack':47B 'boundari':28B 'browser':17B 'collector':24B 'condit':29B 'describ':44B 'esr':38B 'firefox':18B,20B,34B,37B 'fix':32B 'garbag':23B 'incorrect':27B 'javascript':22B 'mozilla':31B 'runtim':19B 'sourc':41B","search_c":"'153.7':66C '160':62C 'boundari':49C 'compon':55C 'condit':50C 'esr':65C 'firefox':61C,64C 'fix':59C 'gc':54C 'incorrect':48C 'javascript':53C 'vulner':57C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:19+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124870","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124870","severity":null,"published_at":"2026-11-10T14:17:19+00:00","modified_at":"2026-11-10T14:17:19+00:00","first_seen_at":"2026-11-10T14:22:14+00:00","fetched_at":"2026-11-10T14:22:14+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"}