{"id":"CVE-2026-124894","kind":"vulnerability","aliases":["CVE-2026-124894"],"related":[],"title":"Firefox: use-after-free in cookie handling may let attacker run code","description":"Use-after-free in the Networking: Cookies component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.","summary":"A use-after-free bug in Firefox's cookie networking code can corrupt memory when a page is loaded. The sources do not state what an attacker gets beyond memory corruption.","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 Firefox version with Help > About Firefox; the sources do not give a version range for affected releases beyond the fixed releases.","fix":"- Firefox: move to `160` or later.\n- Firefox ESR: move to `153.7` or later.","status":"open","published_at":"2026-11-10T14:17:22+00:00","first_seen_at":"2026-11-10T14:22:16+00:00","triaged_at":"2026-11-10T14:25:59+00:00","updated_at":"2026-11-10T14:25:59+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T14:25:59Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: move to `160` or later.\n- Firefox ESR: move to `153.7` or later.","reach":"internet","title":"Firefox: use-after-free in cookie handling may let attacker run code","impact":"high","summary":"A use-after-free bug in Firefox's cookie networking code can corrupt memory when a page is loaded. The sources do not state what an attacker gets beyond memory corruption.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","browsers"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown; memory corruption in the browser, code execution not stated","analyst_note":"Confirm the trigger, whether code execution is shown, and the affected version range from the Mozilla security advisory for this CVE.","how_to_check":"- Check the Firefox version with Help > About Firefox; the sources do not give a version range for affected releases beyond the fixed releases.","plain_action":"Update Firefox to version 160 or Firefox ESR 153.7 or later, using the browser's own update check.","product_name":"","needs_analyst":true,"not_affected_if":["firefox-160-or-later","firefox-esr-153.7-or-later"],"who_is_affected":"Anyone running Firefox or Firefox ESR older than the fixed versions. The sources do not say whether specific settings or sites are needed to trigger it.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000718,"input_tokens":4474,"output_tokens":541,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124894':16A,19A '-2026':15A,18A '153.7':74C '160':70C 'attack':11A,50B 'beyond':52B 'browser':20B 'bug':28B 'code':13A,34B 'compon':63C 'cooki':7A,32B,62C 'corrupt':36B,54B 'cve':14A,17A 'esr':73C 'firefox':1A,21B,30B,69C,72C 'fix':67C 'free':5A,27B,58C 'get':51B 'handl':8A 'let':10A 'load':42B 'may':9A 'memori':37B,53B 'network':33B,61C 'page':40B 'run':12A 'runtim':22B 'sourc':44B 'state':47B 'use':3A,25B,56C 'use-after-fre':2A,24B,55C 'vulner':65C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox or Firefox ESR older than the fixed versions. The sources do not say whether specific settings or sites are needed to trigger it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160 or Firefox ESR 153.7 or later, using the browser's own update check.","pkeys":[],"ptokens":[],"labels":["browsers","firefox","runtime","unknown"],"campaign_type":null,"search_a":"'-124894':16A,19A '-2026':15A,18A 'attack':11A 'code':13A 'cooki':7A 'cve':14A,17A 'firefox':1A 'free':5A 'handl':8A 'let':10A 'may':9A 'run':12A 'use':3A 'use-after-fre':2A","search_b":"'attack':50B 'beyond':52B 'browser':20B 'bug':28B 'code':34B 'cooki':32B 'corrupt':36B,54B 'firefox':21B,30B 'free':27B 'get':51B 'load':42B 'memori':37B,53B 'network':33B 'page':40B 'runtim':22B 'sourc':44B 'state':47B 'use':25B 'use-after-fre':24B","search_c":"'153.7':74C '160':70C 'compon':63C 'cooki':62C 'esr':73C 'firefox':69C,72C 'fix':67C 'free':58C 'network':61C 'use':56C 'use-after-fre':55C 'vulner':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:22+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124894","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124894","severity":null,"published_at":"2026-11-10T14:17:22+00:00","modified_at":"2026-11-10T14:17:22+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"}