{"id":"CVE-2026-117946","kind":"vulnerability","aliases":["CVE-2026-117946"],"related":[],"title":"Firefox: JavaScript engine boundary check flaw, fixed in 159","description":"Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.","summary":"The JavaScript engine in Firefox has an incorrect boundary condition check, according to the NVD entry. The sources do not say what an attacker can read or run as a result.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["desktop-browsers","firefox","runtime"],"not_affected_if":[],"how_to_check":"- Check the Firefox version with `about:support` and compare it against `159`, `115.44` (ESR) or `153.6` (ESR)\n- unknown","fix":"- Update Firefox to `159` or later, or Firefox ESR to `115.44` or `153.6`","status":"open","published_at":"2026-10-27T14:16:50+00:00","first_seen_at":"2026-10-27T14:32:23+00:00","triaged_at":"2026-10-27T14:35:42+00:00","updated_at":"2026-10-27T14:35:42+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-10-27T14:35:42Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later, or Firefox ESR to `115.44` or `153.6`","reach":"unknown","title":"Firefox: JavaScript engine boundary check flaw, fixed in 159","impact":"high","summary":"The JavaScript engine in Firefox has an incorrect boundary condition check, according to the NVD entry. The sources do not say what an attacker can read or run as a result.","category":"runtime","nicknames":[],"who_cares":["firefox","desktop-browsers"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; the sources do not describe the impact","analyst_note":"Find the Mozilla security advisory for the fixed Firefox releases to confirm the impact, trigger and whether it is exploited, starting from https://nvd.nist.gov/vuln/detail/CVE-2026-117946.","how_to_check":"- Check the Firefox version with `about:support` and compare it against `159`, `115.44` (ESR) or `153.6` (ESR)\n- unknown","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Anyone running Firefox builds older than the fixed versions named in the advisory. The sources do not say whether a web page alone can trigger the flaw or whether a particular configuration is needed.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000571,"input_tokens":3260,"output_tokens":491,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117946':12A,15A '-2026':11A,14A '115.44':69C '153.6':73C '159':9A,66C 'accord':32B 'attack':44B 'boundari':4A,29B,53C 'browser':18B 'check':5A,31B 'compon':59C 'condit':30B,54C 'cve':10A,13A 'desktop':17B 'desktop-brows':16B 'engin':3A,23B,58C 'entri':36B 'esr':68C,72C 'firefox':1A,19B,25B,65C,67C,71C 'fix':7A,63C 'flaw':6A 'incorrect':28B,52C 'javascript':2A,22B,57C 'nvd':35B 'read':46B 'result':51B 'run':48B 'runtim':20B 'say':41B 'sourc':38B 'vulner':61C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox builds older than the fixed versions named in the advisory. The sources do not say whether a web page alone can trigger the flaw or whether a particular configuration is needed.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:50+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117946","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117946","severity":null,"published_at":"2026-10-27T14:16:50+00:00","modified_at":"2026-10-27T14:16:50+00:00","first_seen_at":"2026-10-27T14:32:23+00:00","fetched_at":"2026-10-27T14:32:23+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"}