{"id":"CVE-2026-121100","kind":"vulnerability","aliases":["CVE-2026-121100"],"related":[],"title":"Chrome: use-after-free in DOM lets a crafted web page run code","description":"Use after free in DOM 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: High)","summary":"A use-after-free bug in the DOM code 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 the security severity as High.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","managed-fleets","package"],"not_affected_if":["chrome-updated","other-browser"],"how_to_check":"- Open Chrome and check the version under Help > About Google Chrome, or run `chrome --version` on the command line.\n- Compare the installed version against `157.0.8103.38`.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:16+00:00","first_seen_at":"2026-11-03T21:19:13+00:00","triaged_at":"2026-11-03T21:25:19+00:00","updated_at":"2026-11-03T21:25:19+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-03T21:25:19Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: use-after-free in DOM lets a crafted web page run code","impact":"high","summary":"A use-after-free bug in the DOM code 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 the security severity as High.","audience":"everyone","category":"package","nicknames":[],"who_cares":["chrome","browser","desktop","managed-fleets"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker code runs inside the browser sandbox after visiting a page.","analyst_note":"","how_to_check":"- Open Chrome and check the version under Help > About Google Chrome, or run `chrome --version` on the command line.\n- Compare the installed version against `157.0.8103.38`.","plain_action":"Update Google Chrome to version 157.0.8103.38 or later: Help > About Google Chrome.","needs_analyst":false,"not_affected_if":["chrome-updated","other-browser"],"who_is_affected":"Anyone running Google Chrome older than 157.0.8103.38 who visits a page an attacker controls. The sources describe code execution inside the sandbox, not a full escape. Managed fleets that pin Chrome versions should check their pinned build.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000675,"input_tokens":4101,"output_tokens":530,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121100':17A,20A '-2026':16A,19A '157.0.8103.38':42B,76C 'allow':77C 'arbitrari':48B,83C 'attack':46B,80C 'browser':21B,52B 'bug':33B 'chrome':1A,22B,40B,73C 'chromium':59B,93C 'code':14A,37B,49B,84C 'craft':10A,56B,90C 'cve':15A,18A 'desktop':23B 'dom':7A,36B,70C 'execut':82C 'fleet':26B 'free':5A,32B,68C 'googl':39B,72C 'high':65B,96C 'html':57B,91C 'insid':50B,85C 'let':8A,43B 'manag':25B 'managed-fleet':24B 'packag':27B 'page':12A,58B,92C 'prior':74C 'rate':60B 'remot':45B,79C 'run':13A,47B 'sandbox':53B,87C 'secur':62B,94C 'sever':63B,95C 'use':3A,30B,66C 'use-after-fre':2A,29B 'via':54B,88C 'web':11A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome older than 157.0.8103.38 who visits a page an attacker controls. The sources describe code execution inside the sandbox, not a full escape. Managed fleets that pin Chrome versions should check their pinned 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: Help > About Google Chrome.","pkeys":[],"ptokens":[],"labels":["browser","chrome","desktop","high","managedfleets","package"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:16+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121100","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121100","severity":null,"published_at":"2026-11-03T21:17:16+00:00","modified_at":"2026-11-03T21:17:16+00:00","first_seen_at":"2026-11-03T21:19:13+00:00","fetched_at":"2026-11-03T21:19:13+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"}