{"id":"CVE-2026-121226","kind":"vulnerability","aliases":["CVE-2026-121226"],"related":[],"title":"Chrome: V8 type confusion lets a crafted web page run code","description":"Type confusion in V8 in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)","summary":"Google Chrome versions before 157.0.8103.38 have a type confusion bug in the V8 JavaScript engine. A remote attacker can use a crafted HTML page to potentially execute arbitrary code inside the browser sandbox.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","chromium","runtime","v8"],"not_affected_if":["chrome-157-or-later"],"how_to_check":"- Open Chrome's About page (chrome://settings/help) and read the version number\n- Check whether the installed version is below `157.0.8103.38`","fix":"- Google Chrome: move to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:32+00:00","first_seen_at":"2026-11-03T21:19:27+00:00","triaged_at":"2026-11-03T21:21:24+00:00","updated_at":"2026-11-03T21:21:24+00:00","category":"runtime","confidence":0.8,"triage":{"at":"2026-11-03T21:21:24Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later","reach":"internet","title":"Chrome: V8 type confusion lets a crafted web page run code","impact":"high","summary":"Google Chrome versions before 157.0.8103.38 have a type confusion bug in the V8 JavaScript engine. A remote attacker can use a crafted HTML page to potentially execute arbitrary code inside the browser sandbox.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","v8","browsers","chromium"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox via a crafted page","analyst_note":"","how_to_check":"- Open Chrome's About page (chrome://settings/help) and read the version number\n- Check whether the installed version is below `157.0.8103.38`","plain_action":"Update Google Chrome to version 157.0.8103.38 or later: Chrome menu > Help > About Google Chrome.","needs_analyst":false,"not_affected_if":["chrome-157-or-later"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who opens untrusted web pages is exposed, since the flaw is triggered by a crafted HTML page. Chromium-based browsers that pick up the V8 fix are affected in the same way, and managed fleets should check their Chrome version. Users who cannot run a vulnerable build can skip it only once they are on the fixed version.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000693,"input_tokens":4103,"output_tokens":565,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121226':14A,17A '-2026':13A,16A '157.0.8103.38':27B,65C 'allow':66C 'arbitrari':50B,73C 'attack':40B,69C 'browser':18B,54B 'bug':32B 'chrome':1A,19B,24B,62C 'chromium':20B,83C 'code':11A,51B,74C 'confus':4A,31B,57C 'craft':7A,44B,80C 'cve':12A,15A 'engin':37B 'execut':49B,72C 'googl':23B,61C 'high':86C 'html':45B,81C 'insid':52B,75C 'javascript':36B 'let':5A 'page':9A,46B,82C 'potenti':48B,71C 'prior':63C 'remot':39B,68C 'run':10A 'runtim':21B 'sandbox':55B,77C 'secur':84C 'sever':85C 'type':3A,30B,56C 'use':42B 'v8':2A,22B,35B,59C 'version':25B 'via':78C 'web':8A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who opens untrusted web pages is exposed, since the flaw is triggered by a crafted HTML page. Chromium-based browsers that pick up the V8 fix are affected in the same way, and managed fleets should check their Chrome version. Users who cannot run a vulnerable build can skip it only once they are on the fixed version.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome to version 157.0.8103.38 or later: Chrome menu > Help > About Google Chrome.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","chromium","high","runtime","v8"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:32+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121226","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121226","severity":null,"published_at":"2026-11-03T21:17:32+00:00","modified_at":"2026-11-03T21:17:32+00:00","first_seen_at":"2026-11-03T21:19:27+00:00","fetched_at":"2026-11-03T21:19:27+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"}