{"id":"CVE-2026-117875","kind":"vulnerability","aliases":["CVE-2026-117875"],"related":[],"title":"Firefox: use-after-free in scrolling and overflow layout code","description":"Use-after-free in the Layout: Scrolling and Overflow component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.","summary":"A use-after-free bug in Firefox's Layout Scrolling and Overflow component lets memory be reused after it is freed. The sources do not say what an attacker can achieve with it beyond memory corruption.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["firefox-159-or-later","firefox-esr-153.6-or-later"],"how_to_check":"- Run `firefox --version` or check Help > About Firefox and compare with `159` or `153.6` for ESR\n- unknown for other checks, the sources do not say","fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `153.6` or later","status":"open","published_at":"2026-10-27T14:16:42+00:00","first_seen_at":"2026-10-27T14:32:21+00:00","triaged_at":"2026-10-27T14:39:10+00:00","updated_at":"2026-10-27T14:39:10+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-10-27T14:39:10Z","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 scrolling and overflow layout code","impact":"high","summary":"A use-after-free bug in Firefox's Layout Scrolling and Overflow component lets memory be reused after it is freed. The sources do not say what an attacker can achieve with it beyond memory corruption.","category":"runtime","nicknames":[],"who_cares":["firefox","browsers","desktop"],"confidence":0.5,"needs_auth":"unknown","worst_case":"unknown, memory corruption in the browser","analyst_note":"Check the Mozilla security advisory for this CVE to confirm the attack trigger, whether it is exploitable from web content, and the severity rating.","how_to_check":"- Run `firefox --version` or check Help > About Firefox and compare with `159` or `153.6` for ESR\n- unknown for other checks, the sources do not say","needs_analyst":true,"not_affected_if":["firefox-159-or-later","firefox-esr-153.6-or-later"],"who_is_affected":"Anyone running Firefox builds older than version 159 or ESR builds older than 153.6 is affected. The sources do not say whether any configuration or page interaction is needed to trigger it.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000574,"input_tokens":3250,"output_tokens":498,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117875':14A,17A '-2026':13A,16A '153.6':80C '159':76C 'achiev':53B 'attack':51B 'beyond':56B 'browser':18B 'bug':27B 'code':11A 'compon':35B,69C 'corrupt':58B 'cve':12A,15A 'desktop':19B 'esr':79C 'firefox':1A,20B,29B,75C,78C 'fix':73C 'free':5A,26B,62C 'freed':43B 'layout':10A,31B,65C 'let':36B 'memori':37B,57B 'overflow':9A,34B,68C 'reus':39B 'runtim':21B 'say':48B 'scroll':7A,32B,66C 'sourc':45B 'use':3A,24B,60C 'use-after-fre':2A,23B,59C 'vulner':71C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox builds older than version 159 or ESR builds older than 153.6 is affected. The sources do not say whether any configuration or page interaction is needed to trigger it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:42+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117875","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117875","severity":null,"published_at":"2026-10-27T14:16:42+00:00","modified_at":"2026-10-27T14:16:42+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"}