{"id":"CVE-2026-117902","kind":"vulnerability","aliases":["CVE-2026-117902"],"related":[],"title":"Firefox: use-after-free in Layout Text and Fonts component","description":"Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.","summary":"A use-after-free bug in the Layout: Text and Fonts component of Firefox lets memory be reused after it is freed. The sources do not say what an attacker can do with it beyond that.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","other"],"not_affected_if":["firefox-current-release"],"how_to_check":"- Check the installed Firefox version in the browser's About page or with `firefox --version`\n- Check the ESR version if running Firefox ESR, for example with `firefox --version` on the managed host","fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `153.6` or later","status":"open","published_at":"2026-10-27T14:16:45+00:00","first_seen_at":"2026-10-27T14:32:22+00:00","triaged_at":"2026-10-27T14:37:37+00:00","updated_at":"2026-10-27T14:37:37+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-10-27T14:37:37Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `153.6` or later","reach":"unknown","title":"Firefox: use-after-free in Layout Text and Fonts component","impact":"medium","summary":"A use-after-free bug in the Layout: Text and Fonts component of Firefox lets memory be reused after it is freed. The sources do not say what an attacker can do with it beyond that.","category":"other","nicknames":[],"who_cares":["firefox","desktop","browsers"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; memory corruption in the browser, exploit path not stated","analyst_note":"Check the Mozilla security advisory for this CVE to learn the trigger (web content or chrome), exploit impact, and whether a user has to visit a page.","how_to_check":"- Check the installed Firefox version in the browser's About page or with `firefox --version`\n- Check the ESR version if running Firefox ESR, for example with `firefox --version` on the managed host","needs_analyst":true,"not_affected_if":["firefox-current-release"],"who_is_affected":"Anyone running Firefox or Firefox ESR older than the fixed versions, on desktops or managed fleets. The sources do not say whether a page load alone is enough to trigger it or whether any special setting is needed.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000575,"input_tokens":3244,"output_tokens":501,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117902':14A,17A '-2026':13A,16A '153.6':78C '159':74C 'attack':51B 'beyond':56B 'browser':18B 'bug':26B 'compon':11A,33B,67C 'cve':12A,15A 'desktop':19B 'esr':77C 'firefox':1A,20B,35B,73C,76C 'fix':71C 'font':10A,32B,66C 'free':5A,25B,60C 'freed':43B 'layout':7A,29B,63C 'let':36B 'memori':37B 'reus':39B 'say':48B 'sourc':45B 'text':8A,30B,64C 'use':3A,23B,58C 'use-after-fre':2A,22B,57C 'vulner':69C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox or Firefox ESR older than the fixed versions, on desktops or managed fleets. The sources do not say whether a page load alone is enough to trigger it or whether any special setting is needed.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:45+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117902","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117902","severity":null,"published_at":"2026-10-27T14:16:45+00:00","modified_at":"2026-10-27T14:16:45+00:00","first_seen_at":"2026-10-27T14:32:22+00:00","fetched_at":"2026-10-27T14:32:22+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"}