{"id":"CVE-2026-117934","kind":"vulnerability","aliases":["CVE-2026-117934"],"related":[],"title":"Firefox: use-after-free in Layout component can be exploited","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 corrupt memory when a page is rendered. The sources do not say what an attacker gains beyond that, so the exact impact is not confirmed.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktops","firefox","other"],"not_affected_if":[],"how_to_check":"- Check the installed Firefox version in the About Firefox page or with `firefox --version`, and compare it against 159, 115.44 and 153.6.\n- Check whether ESR is in use on managed machines, since ESR branches are listed separately.","fix":"- Update Firefox to `159` or later on the current channel.\n- Update Firefox ESR to `115.44` or `153.6` on the ESR branches.","status":"open","published_at":"2026-10-27T14:16:49+00:00","first_seen_at":"2026-10-27T14:32:23+00:00","triaged_at":"2026-10-27T14:37:02+00:00","updated_at":"2026-10-27T14:37:02+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-10-27T14:37:02Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later on the current channel.\n- Update Firefox ESR to `115.44` or `153.6` on the ESR branches.","reach":"unknown","title":"Firefox: use-after-free in Layout component can be exploited","impact":"medium","summary":"A use-after-free bug in the Layout component of Firefox can corrupt memory when a page is rendered. The sources do not say what an attacker gains beyond that, so the exact impact is not confirmed.","category":"other","nicknames":[],"who_cares":["firefox","browsers","desktops"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown","analyst_note":"Check the Mozilla security advisory for this CVE for the trigger, the crash or code execution impact, and whether it is exploitable from web content.","how_to_check":"- Check the installed Firefox version in the About Firefox page or with `firefox --version`, and compare it against 159, 115.44 and 153.6.\n- Check whether ESR is in use on managed machines, since ESR branches are listed separately.","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Anyone running Firefox builds older than 159, or ESR builds older than 115.44 or 153.6, is affected. The sources do not describe a configuration or role that narrows exposure, so unknown who can skip it.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000579,"input_tokens":3240,"output_tokens":510,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117934':14A,17A '-2026':13A,16A '115.44':76C '153.6':80C '159':73C 'attack':48B 'beyond':50B 'browser':18B 'bug':26B 'compon':8A,30B,66C 'confirm':58B 'corrupt':34B 'cve':12A,15A 'desktop':19B 'esr':75C,79C 'exact':54B 'exploit':11A 'firefox':1A,20B,32B,72C,74C,78C 'fix':70C 'free':5A,25B,62C 'gain':49B 'impact':55B 'layout':7A,29B,65C 'memori':35B 'page':38B 'render':40B 'say':45B 'sourc':42B 'use':3A,23B,60C 'use-after-fre':2A,22B,59C 'vulner':68C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox builds older than 159, or ESR builds older than 115.44 or 153.6, is affected. The sources do not describe a configuration or role that narrows exposure, so unknown who can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:49+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117934","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117934","severity":null,"published_at":"2026-10-27T14:16:49+00:00","modified_at":"2026-10-27T14:16:49+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"}