{"id":"CVE-2026-124884","kind":"vulnerability","aliases":["CVE-2026-124884"],"related":[],"title":"Firefox: JavaScript garbage collector use-after-free fixed in version 160","description":"Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.","summary":"A use-after-free bug in the JavaScript garbage collector of Firefox could let a crafted script corrupt memory. The sources state it was fixed in Firefox 160 and Firefox ESR 153.7, but they do not say what an attacker gains beyond memory corruption.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["up-to-date-firefox"],"how_to_check":"- Check the installed Firefox version in the About Firefox menu, or run `firefox --version` on the machine.\n- Compare it against `160` for Firefox and `153.7` for Firefox ESR.","fix":"- Firefox: `160`\n- Firefox ESR: `153.7`","status":"open","published_at":"2026-11-10T14:17:21+00:00","first_seen_at":"2026-11-10T14:22:15+00:00","triaged_at":"2026-11-10T14:26:09+00:00","updated_at":"2026-11-10T14:26:09+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T14:26:09Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: `160`\n- Firefox ESR: `153.7`","reach":"internet","title":"Firefox: JavaScript garbage collector use-after-free fixed in version 160","impact":"high","summary":"A use-after-free bug in the JavaScript garbage collector of Firefox could let a crafted script corrupt memory. The sources state it was fixed in Firefox 160 and Firefox ESR 153.7, but they do not say what an attacker gains beyond memory corruption.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browsers","desktop"],"confidence":0.5,"fix_status":"available","needs_auth":"no","worst_case":"unknown; memory corruption from a crafted script, impact not stated","analyst_note":"Check the Mozilla security advisory for CVE-2026-124884 to confirm the exploitability and impact beyond memory corruption.","how_to_check":"- Check the installed Firefox version in the About Firefox menu, or run `firefox --version` on the machine.\n- Compare it against `160` for Firefox and `153.7` for Firefox ESR.","plain_action":"Update Firefox to version 160 or Firefox ESR to 153.7 through the browser's update menu.","product_name":"","needs_analyst":true,"not_affected_if":["up-to-date-firefox"],"who_is_affected":"Anyone running a Firefox build older than 160 or Firefox ESR older than 153.7 is exposed, since a web page can run JavaScript that triggers the flaw. Teams that run only current Firefox releases or managed browser builds with updates applied can skip it.","user_interaction":"yes","product_ecosystem":"","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000746,"input_tokens":4474,"output_tokens":597,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124884':15A,18A '-2026':14A,17A '153.7':55B,87C '160':12A,51B,83C 'attack':63B 'beyond':65B 'browser':19B 'bug':28B 'collector':4A,33B 'compon':76C 'corrupt':41B,67B 'could':36B 'craft':39B 'cve':13A,16A 'desktop':20B 'esr':54B,86C 'firefox':1A,21B,35B,50B,53B,82C,85C 'fix':9A,48B,80C 'free':8A,27B,71C 'gain':64B 'garbag':3A,32B 'gc':75C 'javascript':2A,31B,74C 'let':37B 'memori':42B,66B 'runtim':22B 'say':60B 'script':40B 'sourc':44B 'state':45B 'use':6A,25B,69C 'use-after-fre':5A,24B,68C 'version':11A 'vulner':78C","nicknames":[],"mitigations":[],"who_affected":"Anyone running a Firefox build older than 160 or Firefox ESR older than 153.7 is exposed, since a web page can run JavaScript that triggers the flaw. Teams that run only current Firefox releases or managed browser builds with updates applied can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160 or Firefox ESR to 153.7 through the browser's update menu.","pkeys":[],"ptokens":[],"labels":["browsers","desktop","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124884':15A,18A '-2026':14A,17A '160':12A 'collector':4A 'cve':13A,16A 'firefox':1A 'fix':9A 'free':8A 'garbag':3A 'javascript':2A 'use':6A 'use-after-fre':5A 'version':11A","search_b":"'153.7':55B '160':51B 'attack':63B 'beyond':65B 'browser':19B 'bug':28B 'collector':33B 'corrupt':41B,67B 'could':36B 'craft':39B 'desktop':20B 'esr':54B 'firefox':21B,35B,50B,53B 'fix':48B 'free':27B 'gain':64B 'garbag':32B 'javascript':31B 'let':37B 'memori':42B,66B 'runtim':22B 'say':60B 'script':40B 'sourc':44B 'state':45B 'use':25B 'use-after-fre':24B","search_c":"'153.7':87C '160':83C 'compon':76C 'esr':86C 'firefox':82C,85C 'fix':80C 'free':71C 'gc':75C 'javascript':74C 'use':69C 'use-after-fre':68C 'vulner':78C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:21+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124884","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124884","severity":null,"published_at":"2026-11-10T14:17:21+00:00","modified_at":"2026-11-10T14:17:21+00:00","first_seen_at":"2026-11-10T14:22:15+00:00","fetched_at":"2026-11-10T14:22:15+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"}