{"id":"CVE-2026-117903","kind":"vulnerability","aliases":["CVE-2026-117903"],"related":[],"title":"Firefox: use-after-free in Audio/Video component fixed in 159","description":"Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.","summary":"A use-after-free bug in Firefox's Audio/Video component can corrupt memory when it is triggered. The sources do not say what an attacker can gain from it beyond that.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["desktop-browsers","firefox","runtime"],"not_affected_if":["updated-firefox"],"how_to_check":"- Check the installed Firefox version against `159` or ESR `115.44` or `153.6`\n- unknown","fix":"- Update Firefox to `159`\n- Update Firefox ESR to `115.44` or `153.6`","status":"open","published_at":"2026-10-27T14:16:45+00:00","first_seen_at":"2026-10-27T14:32:22+00:00","triaged_at":"2026-10-27T14:37:34+00:00","updated_at":"2026-10-27T14:37:34+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-10-27T14:37:34Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159`\n- Update Firefox ESR to `115.44` or `153.6`","reach":"unknown","title":"Firefox: use-after-free in Audio/Video component fixed in 159","impact":"high","summary":"A use-after-free bug in Firefox's Audio/Video component can corrupt memory when it is triggered. The sources do not say what an attacker can gain from it beyond that.","category":"runtime","nicknames":[],"who_cares":["firefox","desktop-browsers"],"confidence":0.5,"needs_auth":"unknown","worst_case":"unknown; memory corruption could allow code execution","analyst_note":"Check the Mozilla security advisory for this CVE to confirm the trigger, reachability from web content, and whether exploitation is known.","how_to_check":"- Check the installed Firefox version against `159` or ESR `115.44` or `153.6`\n- unknown","needs_analyst":true,"not_affected_if":["updated-firefox"],"who_is_affected":"Firefox installs older than the fixed releases are affected, including ESR branches. The sources do not say which configurations or content trigger the bug, so unknown whether a default install is reachable from a web page.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000552,"input_tokens":3246,"output_tokens":455,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117903':14A,17A '-2026':13A,16A '115.44':71C '153.6':75C '159':11A,68C 'attack':48B 'audio/video':7A,32B,60C 'beyond':53B 'browser':20B 'bug':28B 'compon':8A,33B,61C 'corrupt':35B 'cve':12A,15A 'desktop':19B 'desktop-brows':18B 'esr':70C,74C 'firefox':1A,21B,30B,67C,69C,73C 'fix':9A,65C 'free':5A,27B,57C 'gain':50B 'memori':36B 'runtim':22B 'say':45B 'sourc':42B 'trigger':40B 'use':3A,25B,55C 'use-after-fre':2A,24B,54C 'vulner':63C","nicknames":[],"mitigations":[],"who_affected":"Firefox installs older than the fixed releases are affected, including ESR branches. The sources do not say which configurations or content trigger the bug, so unknown whether a default install is reachable from a web page.","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-2026-117903","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117903","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"}