{"id":"CVE-2026-121218","kind":"vulnerability","aliases":["CVE-2026-121218"],"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 execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)","summary":"A type confusion bug in the V8 JavaScript engine of Google Chrome, before version 157.0.8103.38, lets a remote attacker run arbitrary code inside the browser sandbox when the victim opens a crafted HTML page. Chromium rates it Medium severity.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["android","browser","chrome","desktop","package","v8"],"not_affected_if":["auto-updated-browser","chrome-158-or-later"],"how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `chrome --version` on the command line.\n- Confirm the installed version is `157.0.8103.38` or later.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:31+00:00","first_seen_at":"2026-11-03T21:19:27+00:00","triaged_at":"2026-11-03T21:22:33+00:00","updated_at":"2026-11-03T21:22:33+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-03T21:22:33Z","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":"A type confusion bug in the V8 JavaScript engine of Google Chrome, before version 157.0.8103.38, lets a remote attacker run arbitrary code inside the browser sandbox when the victim opens a crafted HTML page. Chromium rates it Medium severity.","audience":"everyone","category":"package","nicknames":[],"who_cares":["chrome","browser","v8","desktop","android"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox after a page visit","analyst_note":"","how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `chrome --version` on the command line.\n- Confirm the installed version is `157.0.8103.38` or later.","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-158-or-later","auto-updated-browser"],"who_is_affected":"Anyone running Google Chrome on desktop or Android before 157.0.8103.38 is exposed when they visit a malicious or compromised web page. Chromium-based browsers that pull V8 from upstream are likely affected too, but the sources do not say which ones. Users on managed or auto-updated Chrome are usually already patched.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000701,"input_tokens":4105,"output_tokens":580,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121218':14A,17A '-2026':13A,16A '157.0.8103.38':38B,72C 'allow':73C 'android':18B 'arbitrari':44B,79C 'attack':42B,76C 'browser':19B,48B 'bug':27B 'chrome':1A,20B,35B,69C 'chromium':58B,89C 'code':11A,45B,80C 'confus':4A,26B,64C 'craft':7A,55B,86C 'cve':12A,15A 'desktop':21B 'engin':32B 'execut':78C 'googl':34B,68C 'html':56B,87C 'insid':46B,81C 'javascript':31B 'let':5A,39B 'medium':61B,92C 'open':53B 'packag':22B 'page':9A,57B,88C 'prior':70C 'rate':59B 'remot':41B,75C 'run':10A,43B 'sandbox':49B,83C 'secur':90C 'sever':62B,91C 'type':3A,25B,63C 'v8':2A,23B,30B,66C 'version':37B 'via':84C 'victim':52B 'web':8A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome on desktop or Android before 157.0.8103.38 is exposed when they visit a malicious or compromised web page. Chromium-based browsers that pull V8 from upstream are likely affected too, but the sources do not say which ones. Users on managed or auto-updated Chrome are usually already patched.","tier":"C","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":["android","browser","chrome","desktop","medium","package","v8"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:31+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121218","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121218","severity":null,"published_at":"2026-11-03T21:17:31+00:00","modified_at":"2026-11-03T21:17:31+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"}