{"id":"CVE-2026-117882","kind":"vulnerability","aliases":["CVE-2026-117882"],"related":[],"title":"Firefox: use-after-free in Layout component may allow code execution","description":"Use-after-free in the Layout component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.","summary":"A use-after-free bug in the Layout component of Firefox can be triggered and fixed in Firefox 159 and ESR 115.44 and 153.6. The sources do not state what an attacker gains beyond memory corruption.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","other"],"not_affected_if":["fixed-version"],"how_to_check":"- Check the installed Firefox version in the browser's About page or with `firefox --version`\n- Compare against the fixed versions `159`, `115.44` and `153.6`","fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `115.44` or `153.6`","status":"open","published_at":"2026-10-27T14:16:43+00:00","first_seen_at":"2026-10-27T14:32:21+00:00","triaged_at":"2026-10-27T14:37:56+00:00","updated_at":"2026-10-27T14:37:56+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-10-27T14:37:56Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `115.44` or `153.6`","reach":"internet","title":"Firefox: use-after-free in Layout component may allow code execution","impact":"medium","summary":"A use-after-free bug in the Layout component of Firefox can be triggered and fixed in Firefox 159 and ESR 115.44 and 153.6. The sources do not state what an attacker gains beyond memory corruption.","category":"other","nicknames":[],"who_cares":["firefox","desktop","browsers"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; memory corruption in the browser engine","analyst_note":"Check the Mozilla security advisory for this CVE to confirm impact, trigger conditions and whether it is exploited.","how_to_check":"- Check the installed Firefox version in the browser's About page or with `firefox --version`\n- Compare against the fixed versions `159`, `115.44` and `153.6`","needs_analyst":true,"not_affected_if":["fixed-version"],"who_is_affected":"Anyone running Firefox or Firefox ESR builds older than the fixed versions, including desktop users and teams with managed browser fleets. The sources do not say which configurations or content are needed to trigger it. unknown","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000569,"input_tokens":3240,"output_tokens":490,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117882':15A,18A '-2026':14A,17A '115.44':44B,76C '153.6':46B,80C '159':41B,73C 'allow':10A 'attack':54B 'beyond':56B 'browser':19B 'bug':27B 'code':11A 'compon':8A,31B,66C 'corrupt':58B 'cve':13A,16A 'desktop':20B 'esr':43B,75C,79C 'execut':12A 'firefox':1A,21B,33B,40B,72C,74C,78C 'fix':38B,70C 'free':5A,26B,62C 'gain':55B 'layout':7A,30B,65C 'may':9A 'memori':57B 'sourc':48B 'state':51B 'trigger':36B 'use':3A,24B,60C 'use-after-fre':2A,23B,59C 'vulner':68C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox or Firefox ESR builds older than the fixed versions, including desktop users and teams with managed browser fleets. The sources do not say which configurations or content are needed to trigger it. unknown","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:43+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117882","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117882","severity":null,"published_at":"2026-10-27T14:16:43+00:00","modified_at":"2026-10-27T14:16:43+00:00","first_seen_at":"2026-10-27T14:32:21+00:00","fetched_at":"2026-10-27T14:32:21+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"}