{"id":"CVE-2026-117892","kind":"vulnerability","aliases":["CVE-2026-117892"],"related":[],"title":"Firefox: WebRTC networking use-after-free lets attackers escalate privileges","description":"Privilege escalation due to use-after-free in the WebRTC: Networking 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 WebRTC networking component of Firefox allows privilege escalation. The sources do not say what an attacker must do first or how the escalation is reached.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["fixed-version"],"how_to_check":"- Check the installed Firefox version with `firefox --version` and compare it to the fixed releases.\n- Confirm whether WebRTC is in use in the browser or in any Firefox-based embedded product.","fix":"- Update Firefox to `159` or later.\n- Update Firefox ESR to `115.44` or `153.6` or later.","status":"open","published_at":"2026-10-27T14:16:44+00:00","first_seen_at":"2026-10-27T14:32:22+00:00","triaged_at":"2026-10-27T14:37:46+00:00","updated_at":"2026-10-27T14:37:46+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-10-27T14:37:46Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later.\n- Update Firefox ESR to `115.44` or `153.6` or later.","reach":"unknown","title":"Firefox: WebRTC networking use-after-free lets attackers escalate privileges","impact":"high","summary":"A use-after-free bug in the WebRTC networking component of Firefox allows privilege escalation. The sources do not say what an attacker must do first or how the escalation is reached.","category":"runtime","nicknames":[],"who_cares":["firefox","browsers","desktop"],"confidence":0.5,"needs_auth":"unknown","worst_case":"attacker escalates privileges within the browser process","analyst_note":"Check the Mozilla security advisory for this CVE to confirm the trigger, whether web content alone suffices, and the exact affected version ranges.","how_to_check":"- Check the installed Firefox version with `firefox --version` and compare it to the fixed releases.\n- Confirm whether WebRTC is in use in the browser or in any Firefox-based embedded product.","needs_analyst":true,"not_affected_if":["fixed-version"],"who_is_affected":"Any installation of Firefox or Firefox ESR older than the fixed releases is affected, since the flaw is in the browser's WebRTC networking code. The sources do not say whether a page visit alone is enough to trigger it. Systems that already run the fixed versions can skip it.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000589,"input_tokens":3268,"output_tokens":524,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117892':14A,17A '-2026':13A,16A '115.44':77C '153.6':81C '159':74C 'allow':35B 'attack':9A,45B 'browser':18B 'bug':27B 'compon':32B,67C 'cve':12A,15A 'desktop':19B 'due':57C 'escal':10A,37B,52B,56C 'esr':76C,80C 'firefox':1A,20B,34B,73C,75C,79C 'first':48B 'fix':71C 'free':7A,26B,62C 'let':8A 'must':46B 'network':3A,31B,66C 'privileg':11A,36B,55C 'reach':54B 'runtim':21B 'say':42B 'sourc':39B 'use':5A,24B,60C 'use-after-fre':4A,23B,59C 'vulner':69C 'webrtc':2A,30B,65C","nicknames":[],"mitigations":[],"who_affected":"Any installation of Firefox or Firefox ESR older than the fixed releases is affected, since the flaw is in the browser's WebRTC networking code. The sources do not say whether a page visit alone is enough to trigger it. Systems that already run the fixed versions can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:44+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117892","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117892","severity":null,"published_at":"2026-10-27T14:16:44+00:00","modified_at":"2026-10-27T14:16:44+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"}