{"id":"CVE-2026-121203","kind":"vulnerability","aliases":["CVE-2026-121203"],"related":[],"title":"Chrome: use-after-free in Geometry lets crafted web page run code","description":"Use after free in Geometry 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: Critical)","summary":"A use-after-free bug in the Geometry component of Google Chrome before 157.0.8103.38 lets a remote attacker run arbitrary code inside the browser sandbox via a crafted HTML page. Chromium rates it Critical.","severity":"critical","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","runtime"],"not_affected_if":["chrome-updated","non-chromium-browser"],"how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `google-chrome --version` on Linux\n- Compare the installed version with `157.0.8103.38`","fix":"- Google Chrome: `157.0.8103.38`","status":"open","published_at":"2026-11-03T21:17:29+00:00","first_seen_at":"2026-11-03T21:19:26+00:00","triaged_at":"2026-11-03T21:22:49+00:00","updated_at":"2026-11-03T21:22:49+00:00","category":"runtime","confidence":0.8,"triage":{"at":"2026-11-03T21:22:48Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: `157.0.8103.38`","reach":"internet","title":"Chrome: use-after-free in Geometry lets crafted web page run code","impact":"high","summary":"A use-after-free bug in the Geometry component of Google Chrome before 157.0.8103.38 lets a remote attacker run arbitrary code inside the browser sandbox via a crafted HTML page. Chromium rates it Critical.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox after a visit","analyst_note":"","how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `google-chrome --version` on Linux\n- Compare the installed version with `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-updated","non-chromium-browser"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Servers and automated systems are exposed only if they browse untrusted web content with an affected Chrome build.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"critical"},"cost_usd":0.000668,"input_tokens":4104,"output_tokens":515,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121203':16A,19A '-2026':15A,18A '157.0.8103.38':38B,69C 'allow':70C 'arbitrari':44B,76C 'attack':42B,73C 'browser':20B,48B 'bug':29B 'chrome':1A,21B,36B,66C 'chromium':55B,86C 'code':13A,45B,77C 'compon':33B 'craft':9A,52B,83C 'critic':58B,89C 'cve':14A,17A 'desktop':22B 'execut':75C 'free':5A,28B,61C 'geometri':7A,32B,63C 'googl':35B,65C 'html':53B,84C 'insid':46B,78C 'let':8A,39B 'page':11A,54B,85C 'prior':67C 'rate':56B 'remot':41B,72C 'run':12A,43B 'runtim':23B 'sandbox':49B,80C 'secur':87C 'sever':88C 'use':3A,26B,59C 'use-after-fre':2A,25B 'via':50B,81C 'web':10A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Servers and automated systems are exposed only if they browse untrusted web content with an affected Chrome build.","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","critical","desktop","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:29+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121203","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121203","severity":null,"published_at":"2026-11-03T21:17:29+00:00","modified_at":"2026-11-03T21:17:29+00:00","first_seen_at":"2026-11-03T21:19:26+00:00","fetched_at":"2026-11-03T21:19:26+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"}