{"id":"CVE-2026-118019","kind":"vulnerability","aliases":["CVE-2026-118019"],"related":[],"title":"Firefox: use-after-free in DOM File component allows memory corruption","description":"Race condition, use-after-free in the DOM: File component. This vulnerability was fixed in Firefox 159.","summary":"A race condition causes a use-after-free in Firefox's DOM File component, which can corrupt memory while a page runs. The sources do not say what an attacker can achieve beyond that.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","desktop","firefox","runtime"],"not_affected_if":["firefox-159-or-later"],"how_to_check":"- Check the installed Firefox version with `firefox --version` or Help > About Firefox; versions below 159 are the ones the fix addresses.","fix":"- Update Firefox to `159` or later.","status":"open","published_at":"2026-10-27T14:16:59+00:00","first_seen_at":"2026-10-27T14:32:25+00:00","triaged_at":"2026-10-27T14:33:27+00:00","updated_at":"2026-10-27T14:33:27+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-10-27T14:33:27Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later.","reach":"internet","title":"Firefox: use-after-free in DOM File component allows memory corruption","impact":"high","summary":"A race condition causes a use-after-free in Firefox's DOM File component, which can corrupt memory while a page runs. The sources do not say what an attacker can achieve beyond that.","category":"runtime","nicknames":[],"who_cares":["firefox","browser","desktop"],"confidence":0.5,"needs_auth":"no","worst_case":"Memory corruption in the browser, possibly leading to code execution; unknown from sources.","analyst_note":"Check the Mozilla security advisory for this CVE for exploitability, the CVSS score and whether code execution is confirmed.","how_to_check":"- Check the installed Firefox version with `firefox --version` or Help > About Firefox; versions below 159 are the ones the fix addresses.","needs_analyst":true,"not_affected_if":["firefox-159-or-later"],"who_is_affected":"Anyone running Firefox builds older than 159 with a browser that loads untrusted web content. The sources do not state which platforms or configurations are affected beyond that. Users on current Firefox releases can skip it.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000552,"input_tokens":3227,"output_tokens":459,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-118019':15A,18A '-2026':14A,17A '159':74C 'achiev':55B 'allow':10A 'attack':53B 'beyond':56B 'browser':19B 'caus':26B 'compon':9A,37B,67C 'condit':25B,58C 'corrupt':12A,40B 'cve':13A,16A 'desktop':20B 'dom':7A,35B,65C 'file':8A,36B,66C 'firefox':1A,21B,33B,73C 'fix':71C 'free':5A,31B,62C 'memori':11A,41B 'page':44B 'race':24B,57C 'run':45B 'runtim':22B 'say':50B 'sourc':47B 'use':3A,29B,60C 'use-after-fre':2A,28B,59C 'vulner':69C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox builds older than 159 with a browser that loads untrusted web content. The sources do not state which platforms or configurations are affected beyond that. Users on current Firefox releases can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:59+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118019","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118019","severity":null,"published_at":"2026-10-27T14:16:59+00:00","modified_at":"2026-10-27T14:16:59+00:00","first_seen_at":"2026-10-27T14:32:25+00:00","fetched_at":"2026-10-27T14:32:25+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"}