{"id":"CVE-2026-117884","kind":"vulnerability","aliases":["CVE-2026-117884"],"related":[],"title":"Firefox: use-after-free in Networking component could allow code execution","description":"Use-after-free in the 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 Networking component of Firefox was fixed in Firefox 159 and Firefox ESR 115.44 and 153.6. The sources do not say what an attacker can do with it beyond the memory corruption class.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","desktop","firefox","runtime"],"not_affected_if":["patched-firefox-release"],"how_to_check":"- Run `firefox --version` (or check Help > About) and compare against `159`, `115.44` or `153.6` for ESR\n- unknown for anything beyond the version check","fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `115.44` or `153.6`","status":"open","published_at":"2026-10-27T14:16:43+00:00","first_seen_at":"2026-10-27T14:32:21+00:00","triaged_at":"2026-10-27T14:37:54+00:00","updated_at":"2026-10-27T14:37:54+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-10-27T14:37:54Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `115.44` or `153.6`","reach":"unknown","title":"Firefox: use-after-free in Networking component could allow code execution","impact":"high","summary":"A use-after-free bug in the Networking component of Firefox was fixed in Firefox 159 and Firefox ESR 115.44 and 153.6. The sources do not say what an attacker can do with it beyond the memory corruption class.","category":"runtime","nicknames":[],"who_cares":["firefox","desktop","browsers"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; memory corruption in the browser networking stack","analyst_note":"Check the Mozilla security advisory for the CVE-2026-117884 entry to confirm trigger conditions, exploitability and whether web content can reach the bug.","how_to_check":"- Run `firefox --version` (or check Help > About) and compare against `159`, `115.44` or `153.6` for ESR\n- unknown for anything beyond the version check","needs_analyst":true,"not_affected_if":["patched-firefox-release"],"who_is_affected":"Anyone running an affected Firefox release on a desktop or server where the browser is installed. The sources do not say which networking path triggers the flaw or whether web content alone can reach it.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000576,"input_tokens":3240,"output_tokens":503,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117884':15A,18A '-2026':14A,17A '115.44':43B,80C '153.6':45B,84C '159':39B,77C 'allow':10A 'attack':53B 'beyond':58B 'browser':19B 'bug':28B 'class':62B 'code':11A 'compon':8A,32B,70C 'corrupt':61B 'could':9A 'cve':13A,16A 'desktop':20B 'esr':42B,79C,83C 'execut':12A 'firefox':1A,21B,34B,38B,41B,76C,78C,82C 'fix':36B,74C 'free':5A,27B,66C 'memori':60B 'network':7A,31B,69C 'runtim':22B 'say':50B 'sourc':47B 'use':3A,25B,64C 'use-after-fre':2A,24B,63C 'vulner':72C","nicknames":[],"mitigations":[],"who_affected":"Anyone running an affected Firefox release on a desktop or server where the browser is installed. The sources do not say which networking path triggers the flaw or whether web content alone can reach it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:43+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117884","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117884","severity":null,"published_at":"2026-10-27T14:16:43+00:00","modified_at":"2026-10-27T14:16:43+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"}