{"id":"CVE-2026-124878","kind":"vulnerability","aliases":["CVE-2026-124878"],"related":[],"title":"Firefox: use-after-free in Layout Positioned component fixed in 160","description":"Use-after-free in the Layout: Positioned component. This vulnerability was fixed in Firefox 160.","summary":"A memory-safety bug (use-after-free) in the Firefox layout engine's Positioned component was fixed in Firefox 160. The sources do not say what an attacker can do with it beyond the memory corruption.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","firefox","other"],"not_affected_if":[],"how_to_check":"- Check the installed Firefox version in Firefox's About menu or with `firefox --version`","fix":"- Firefox: move to `160` or later","status":"open","published_at":"2026-11-10T14:17:20+00:00","first_seen_at":"2026-11-10T14:22:14+00:00","triaged_at":"2026-11-10T14:26:16+00:00","updated_at":"2026-11-10T14:26:16+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T14:26:16Z","model":"claude-haiku-5-5","output":{"fix":"- Firefox: move to `160` or later\n- unknown","reach":"unknown","title":"Firefox: use-after-free in Layout Positioned component fixed in 160","impact":"medium","summary":"A memory-safety bug (use-after-free) in the Firefox layout engine's Positioned component was fixed in Firefox 160. The sources do not say what an attacker can do with it beyond the memory corruption.","audience":"everyone","category":"other","nicknames":[],"who_cares":["firefox","browser"],"confidence":0.5,"fix_status":"available","needs_auth":"unknown","worst_case":"unknown; memory corruption in the browser engine","analyst_note":"Check the NVD entry and Mozilla's Firefox 160 security advisories to confirm impact, reach and whether user interaction (such as visiting a page) is required.","how_to_check":"- Check the installed Firefox version in Firefox's About menu or with `firefox --version`\n- unknown","plain_action":"Update Firefox to version 160 or later: open the Firefox menu, go to Help, then About Firefox.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Firefox installs whose version is older than 160. The sources do not say whether any configuration or user action is needed to be exposed.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000688,"input_tokens":4461,"output_tokens":484,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-124878':15A,18A '-2026':14A,17A '160':12A,42B,74C 'attack':50B 'beyond':55B 'browser':19B 'bug':25B 'compon':9A,37B,67C 'corrupt':58B 'cve':13A,16A 'engin':34B 'firefox':1A,20B,32B,41B,73C 'fix':10A,39B,71C 'free':5A,29B,62C 'layout':7A,33B,65C 'memori':23B,57B 'memory-safeti':22B 'posit':8A,36B,66C 'safeti':24B 'say':47B 'sourc':44B 'use':3A,27B,60C 'use-after-fre':2A,26B,59C 'vulner':69C","nicknames":[],"mitigations":[],"who_affected":"Firefox installs whose version is older than 160. The sources do not say whether any configuration or user action is needed to be exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Firefox to version 160 or later: open the Firefox menu, go to Help, then About Firefox.","pkeys":[],"ptokens":[],"labels":["browser","firefox","other","unknown"],"campaign_type":null,"search_a":"'-124878':15A,18A '-2026':14A,17A '160':12A 'compon':9A 'cve':13A,16A 'firefox':1A 'fix':10A 'free':5A 'layout':7A 'posit':8A 'use':3A 'use-after-fre':2A","search_b":"'160':42B 'attack':50B 'beyond':55B 'browser':19B 'bug':25B 'compon':37B 'corrupt':58B 'engin':34B 'firefox':20B,32B,41B 'fix':39B 'free':29B 'layout':33B 'memori':23B,57B 'memory-safeti':22B 'posit':36B 'safeti':24B 'say':47B 'sourc':44B 'use':27B 'use-after-fre':26B","search_c":"'160':74C 'compon':67C 'firefox':73C 'fix':71C 'free':62C 'layout':65C 'posit':66C 'use':60C 'use-after-fre':59C 'vulner':69C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T14:17:20+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-124878","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124878","severity":null,"published_at":"2026-11-10T14:17:20+00:00","modified_at":"2026-11-10T14:17:20+00:00","first_seen_at":"2026-11-10T14:22:14+00:00","fetched_at":"2026-11-10T14:22:14+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}