{"id":"CVE-2026-121078","kind":"vulnerability","aliases":["CVE-2026-121078"],"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":"A type confusion bug in the V8 JavaScript engine in Google Chrome lets a remote attacker run arbitrary code inside the browser sandbox when the victim opens a crafted HTML page. Chromium rates it High severity, and the sources do not say it is exploited in the wild.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","endpoints","runtime"],"not_affected_if":["chrome-updated"],"how_to_check":"- Open Chrome's version page at `chrome://version` and compare the version to `157.0.8103.38`\n- Check managed browser fleets for Chrome builds below `157.0.8103.38`","fix":"- Google Chrome: move to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:13+00:00","first_seen_at":"2026-11-03T21:19:12+00:00","triaged_at":"2026-11-03T21:26:50+00:00","updated_at":"2026-11-03T21:26:50+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:26:50Z","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 in Google Chrome lets a remote attacker run arbitrary code inside the browser sandbox when the victim opens a crafted HTML page. Chromium rates it High severity, and the sources do not say it is exploited in the wild.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","endpoints"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox on the visitor's machine","analyst_note":"","how_to_check":"- Open Chrome's version page at `chrome://version` and compare the version to `157.0.8103.38`\n- Check managed browser fleets for Chrome builds below `157.0.8103.38`","plain_action":"Update Google Chrome to version 157.0.8103.38 or later, then restart the browser.","needs_analyst":false,"not_affected_if":["chrome-updated"],"who_is_affected":"Anyone running Google Chrome older than 157.0.8103.38 is exposed when they visit a malicious or compromised web page. The sources do not describe a server-side path, so the risk sits in the browser on the endpoint. Teams that manage browsers centrally should check their fleet versions.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000684,"input_tokens":4103,"output_tokens":548,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121078':14A,17A '-2026':13A,16A '157.0.8103.38':79C 'allow':80C 'arbitrari':39B,87C 'attack':37B,83C 'browser':18B,43B 'bug':25B 'chrome':1A,19B,33B,76C 'chromium':53B,97C 'code':11A,40B,88C 'confus':4A,24B,71C 'craft':7A,50B,94C 'cve':12A,15A 'endpoint':20B 'engin':30B 'execut':86C 'exploit':66B 'googl':32B,75C 'high':56B,100C 'html':51B,95C 'insid':41B,89C 'javascript':29B 'let':5A,34B 'open':48B 'page':9A,52B,96C 'potenti':85C 'prior':77C 'rate':54B 'remot':36B,82C 'run':10A,38B 'runtim':21B 'sandbox':44B,91C 'say':63B 'secur':98C 'sever':57B,99C 'sourc':60B 'type':3A,23B,70C 'v8':2A,28B,73C 'via':92C 'victim':47B 'web':8A 'wild':69B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome older than 157.0.8103.38 is exposed when they visit a malicious or compromised web page. The sources do not describe a server-side path, so the risk sits in the browser on the endpoint. Teams that manage browsers centrally should check their fleet versions.","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, then restart the browser.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","endpoints","high","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:13+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121078","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121078","severity":null,"published_at":"2026-11-03T21:17:13+00:00","modified_at":"2026-11-03T21:17:13+00:00","first_seen_at":"2026-11-03T21:19:12+00:00","fetched_at":"2026-11-03T21:19:12+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"}