{"id":"CVE-2026-124935","kind":"vulnerability","aliases":["CVE-2026-124935"],"related":[],"title":"Firefox: undefined behavior in WebRTC networking code, fixed in 160","description":"Undefined behavior in the WebRTC: Networking component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.","summary":"Firefox's WebRTC networking component contains undefined behavior, meaning the code can act unpredictably when it runs. The sources do not state what an attacker can achieve from it.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["firefox","runtime","webrtc"],"not_affected_if":["already-on-fixed-version"],"how_to_check":"- Check the Firefox version with `about:support` in the address bar and compare it against the fixed versions below.","fix":"- Firefox: move to `160` or later.\n- Firefox ESR: move to `153.7` or later.","status":"open","published_at":"2026-11-10T14:17:27+00:00","first_seen_at":"2026-11-10T14:22:19+00:00","triaged_at":"2026-11-10T14:24:13+00:00","updated_at":"2026-11-10T14:24:13+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T14:24:13Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: move to `160` or later.\n- Firefox ESR: move to `153.7` or later.","reach":"unknown","title":"Firefox: undefined behavior in WebRTC networking code, fixed in 160","impact":"medium","summary":"Firefox's WebRTC networking component contains undefined behavior, meaning the code can act unpredictably when it runs. The sources do not state what an attacker can achieve from it.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["firefox","webrtc"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown; sources only say undefined behavior","analyst_note":"Check the Mozilla advisory for CVE-2026-124935 to learn the actual impact and trigger conditions; NVD text alone is thin.","how_to_check":"- Check the Firefox version with `about:support` in the address bar and compare it against the fixed versions below.","plain_action":"Update Firefox to version 160 or the ESR release 153.7 or later, using the browser's update check.","product_name":"","needs_analyst":true,"not_affected_if":["already-on-fixed-version"],"who_is_affected":"Anyone running Firefox before the fixed versions, since the flaw sits in the browser's WebRTC networking code. Sources do not say whether it needs a specific site, call or setting to trigger.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000707,"input_tokens":4478,"output_tokens":518,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124935':13A,16A '-2026':12A,15A '153.7':64C '160':10A,60C 'achiev':46B 'act':32B 'attack':44B 'behavior':3A,27B,48C 'code':7A,30B 'compon':24B,53C 'contain':25B 'cve':11A,14A 'esr':63C 'firefox':1A,17B,20B,59C,62C 'fix':8A,57C 'mean':28B 'network':6A,23B,52C 'run':36B 'runtim':18B 'sourc':38B 'state':41B 'undefin':2A,26B,47C 'unpredict':33B 'vulner':55C 'webrtc':5A,19B,22B,51C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox before the fixed versions, since the flaw sits in the browser's WebRTC networking code. Sources do not say whether it needs a specific site, call or setting to trigger.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160 or the ESR release 153.7 or later, using the browser's update check.","pkeys":[],"ptokens":[],"labels":["firefox","runtime","unknown","webrtc"],"campaign_type":null,"search_a":"'-124935':13A,16A '-2026':12A,15A '160':10A 'behavior':3A 'code':7A 'cve':11A,14A 'firefox':1A 'fix':8A 'network':6A 'undefin':2A 'webrtc':5A","search_b":"'achiev':46B 'act':32B 'attack':44B 'behavior':27B 'code':30B 'compon':24B 'contain':25B 'firefox':17B,20B 'mean':28B 'network':23B 'run':36B 'runtim':18B 'sourc':38B 'state':41B 'undefin':26B 'unpredict':33B 'webrtc':19B,22B","search_c":"'153.7':64C '160':60C 'behavior':48C 'compon':53C 'esr':63C 'firefox':59C,62C 'fix':57C 'network':52C 'undefin':47C 'vulner':55C 'webrtc':51C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:27+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124935","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124935","severity":null,"published_at":"2026-11-10T14:17:27+00:00","modified_at":"2026-11-10T14:17:27+00:00","first_seen_at":"2026-11-10T14:22:19+00:00","fetched_at":"2026-11-10T14:22:19+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"}