{"id":"CVE-2026-117982","kind":"vulnerability","aliases":["CVE-2026-117982"],"related":[],"title":"Firefox: JavaScript JIT invalid pointer flaw may allow code execution","description":"Invalid pointer in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.","summary":"A bad pointer in the JIT component of Firefox's JavaScript engine was fixed in Firefox 159 and Firefox ESR 153.6. The sources do not state what an attacker gains, but invalid pointers in JIT code commonly lead to memory corruption.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser-users","desktop","firefox","runtime"],"not_affected_if":["fixed-version","other-browser"],"how_to_check":"- Check the installed Firefox version with `firefox --version` or Help > About Firefox\n- Check ESR installs with `firefox --version` against the ESR line\n- unknown for any other check, the sources do not say","fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `153.6` or later","status":"open","published_at":"2026-10-27T14:16:56+00:00","first_seen_at":"2026-10-27T14:32:24+00:00","triaged_at":"2026-10-27T14:35:07+00:00","updated_at":"2026-10-27T14:35:07+00:00","category":"runtime","confidence":0.4,"triage":{"at":"2026-10-27T14:35:07Z","model":"claude-haiku-5-5","output":{"fix":"- Update Firefox to `159` or later\n- Update Firefox ESR to `153.6` or later","reach":"internet","title":"Firefox: JavaScript JIT invalid pointer flaw may allow code execution","impact":"high","summary":"A bad pointer in the JIT component of Firefox's JavaScript engine was fixed in Firefox 159 and Firefox ESR 153.6. The sources do not state what an attacker gains, but invalid pointers in JIT code commonly lead to memory corruption.","category":"runtime","nicknames":[],"who_cares":["firefox","desktop","browser-users"],"confidence":0.4,"needs_auth":"unknown","worst_case":"unknown; memory corruption in the JavaScript engine could allow code execution","analyst_note":"Find the Mozilla advisory and bug entry for CVE-2026-117982 to confirm the trigger, the required user action and the attacker outcome.","how_to_check":"- Check the installed Firefox version with `firefox --version` or Help > About Firefox\n- Check ESR installs with `firefox --version` against the ESR line\n- unknown for any other check, the sources do not say","needs_analyst":true,"not_affected_if":["fixed-version","other-browser"],"who_is_affected":"Anyone running Firefox builds older than 159 or Firefox ESR builds older than 153.6 is affected. Systems that only run other browsers or Firefox builds at or above the fixed versions can skip it. The sources do not describe the exact trigger, so whether a web page alone is enough is unknown.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000613,"input_tokens":3248,"output_tokens":577,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-117982':13A,16A '-2026':12A,15A '153.6':43B,82C '159':39B,78C 'allow':8A 'attack':51B 'bad':24B 'browser':18B 'browser-us':17B 'code':9A,58B 'common':59B 'compon':29B,71C 'corrupt':63B 'cve':11A,14A 'desktop':20B 'engin':34B,69C 'esr':42B,81C 'execut':10A 'firefox':1A,21B,31B,38B,41B,77C,80C 'fix':36B,75C 'flaw':6A 'gain':52B 'invalid':4A,54B,64C 'javascript':2A,33B,68C 'jit':3A,28B,57B,70C 'lead':60B 'may':7A 'memori':62B 'pointer':5A,25B,55B,65C 'runtim':22B 'sourc':45B 'state':48B 'user':19B 'vulner':73C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Firefox builds older than 159 or Firefox ESR builds older than 153.6 is affected. Systems that only run other browsers or Firefox builds at or above the fixed versions can skip it. The sources do not describe the exact trigger, so whether a web page alone is enough is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T14:16:56+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-117982","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117982","severity":null,"published_at":"2026-10-27T14:16:56+00:00","modified_at":"2026-10-27T14:16:56+00:00","first_seen_at":"2026-10-27T14:32:24+00:00","fetched_at":"2026-10-27T14:32:24+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"}