{"id":"CVE-2026-121083","kind":"vulnerability","aliases":["CVE-2026-121083"],"related":[],"title":"Chrome: use-after-free in compositing lets a web page run code","description":"Use after free in Compositing 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 Compositing component of Google Chrome before 157.0.8103.38 lets a remote attacker run arbitrary code inside the browser sandbox. The attack works through a specially crafted HTML page that the victim opens.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","endpoints","runtime"],"not_affected_if":["chrome-updated","non-chrome-browser"],"how_to_check":"- Check the installed Chrome version in the browser's About page or with `google-chrome --version`; versions below `157.0.8103.38` are exposed.\n- On managed machines, query the installed browser version through the device management tool.","fix":"- Google Chrome: update 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":"2026-11-03T21:26:46+00:00","updated_at":"2026-11-03T21:26:46+00:00","category":"runtime","confidence":0.8,"triage":{"at":"2026-11-03T21:26:46Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: update to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: use-after-free in compositing lets a web page run code","impact":"high","summary":"A use-after-free bug in the Compositing component of Google Chrome before 157.0.8103.38 lets a remote attacker run arbitrary code inside the browser sandbox. The attack works through a specially crafted HTML page that the victim opens.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browser","desktop","endpoints"],"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":"- Check the installed Chrome version in the browser's About page or with `google-chrome --version`; versions below `157.0.8103.38` are exposed.\n- On managed machines, query the installed browser version through the device management tool.","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-chrome-browser"],"who_is_affected":"Any device running Google Chrome before 157.0.8103.38 is exposed when a user visits a malicious web page. Managed fleets and kiosks running Chrome should be inventoried for the browser version. Systems on a current Chrome release are not affected.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000685,"input_tokens":4102,"output_tokens":549,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121083':16A,19A '-2026':15A,18A '157.0.8103.38':39B,74C 'allow':75C 'arbitrari':45B,81C 'attack':43B,52B,78C 'browser':20B,49B 'bug':30B 'chrome':1A,21B,37B,71C 'chromium':91C 'code':13A,46B,82C 'compon':34B 'composit':7A,33B,68C 'craft':57B,88C 'cve':14A,17A 'desktop':22B 'endpoint':23B 'execut':80C 'free':5A,29B,66C 'googl':36B,70C 'high':94C 'html':58B,89C 'insid':47B,83C 'let':8A,40B 'open':63B 'page':11A,59B,90C 'prior':72C 'remot':42B,77C 'run':12A,44B 'runtim':24B 'sandbox':50B,85C 'secur':92C 'sever':93C 'special':56B 'use':3A,27B,64C 'use-after-fre':2A,26B 'via':86C 'victim':62B 'web':10A 'work':53B","nicknames":[],"mitigations":[],"who_affected":"Any device running Google Chrome before 157.0.8103.38 is exposed when a user visits a malicious web page. Managed fleets and kiosks running Chrome should be inventoried for the browser version. Systems on a current Chrome release are not affected.","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":["browser","chrome","desktop","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-2026-121083","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121083","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"}