{"id":"CVE-2026-117932","kind":"vulnerability","aliases":["CVE-2026-117932"],"related":[],"title":"Firefox: use-after-free in DOM core and HTML lets attackers run code","description":"Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.","summary":"A use-after-free flaw in the DOM Core and HTML component of Firefox was fixed in Firefox 159 and Firefox ESR 153.6. The sources do not state the attacker's exact gain, but use-after-free bugs in browser engines are commonly abused to run code.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["already-on-fixed-version"],"how_to_check":"- Open the Firefox version under Help > About Firefox, or run `firefox --version` on the machine\n- Check whether the installed version is below `159` (Firefox) or `153.6` (Firefox ESR)","fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `153.6` or later","status":"open","published_at":"2026-10-27T14:16:48+00:00","first_seen_at":"2026-10-27T14:32:23+00:00","triaged_at":"2026-10-27T14:37:06+00:00","updated_at":"2026-10-27T14:37:06+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-10-27T14:37:06Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `153.6` or later","reach":"internet","title":"Firefox: use-after-free in DOM core and HTML lets attackers run code","impact":"high","summary":"A use-after-free flaw in the DOM Core and HTML component of Firefox was fixed in Firefox 159 and Firefox ESR 153.6. The sources do not state the attacker's exact gain, but use-after-free bugs in browser engines are commonly abused to run code.","category":"runtime","nicknames":[],"who_cares":["firefox","browsers","desktop"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown, likely code execution in the browser process","analyst_note":"Check the Mozilla security advisory for this CVE to confirm exploitability, trigger conditions and whether it is exploited in the wild.","how_to_check":"- Open the Firefox version under Help > About Firefox, or run `firefox --version` on the machine\n- Check whether the installed version is below `159` (Firefox) or `153.6` (Firefox ESR)","needs_analyst":true,"not_affected_if":["already-on-fixed-version"],"who_is_affected":"Anyone running Firefox or Firefox ESR below the fixed versions on desktops or managed endpoints is affected. The sources do not say whether specific configurations or content types are required to trigger it, so unknown for finer scoping.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000593,"input_tokens":3242,"output_tokens":538,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117932':17A,20A '-2026':16A,19A '153.6':48B,94C '159':44B,90C 'abus':70B 'attack':12A,55B 'browser':21B,66B 'bug':64B 'code':14A,73B 'common':69B 'compon':37B,83C 'core':8A,34B,81C 'cve':15A,18A 'desktop':22B 'dom':7A,33B,80C 'engin':67B 'esr':47B,93C 'exact':57B 'firefox':1A,23B,39B,43B,46B,89C,92C 'fix':41B,87C 'flaw':30B 'free':5A,29B,63B,77C 'gain':58B 'html':10A,36B,82C 'let':11A 'run':13A,72B 'runtim':24B 'sourc':50B 'state':53B 'use':3A,27B,61B,75C 'use-after-fre':2A,26B,60B,74C 'vulner':85C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox or Firefox ESR below the fixed versions on desktops or managed endpoints is affected. The sources do not say whether specific configurations or content types are required to trigger it, so unknown for finer scoping.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:48+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117932","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117932","severity":null,"published_at":"2026-10-27T14:16:48+00:00","modified_at":"2026-10-27T14:16:48+00:00","first_seen_at":"2026-10-27T14:32:23+00:00","fetched_at":"2026-10-27T14:32:23+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}