{"id":"CVE-2026-121036","kind":"vulnerability","aliases":["CVE-2026-121036"],"related":[],"title":"Chrome: use-after-free in CSS lets a crafted page run code","description":"Use after free in CSS 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 CSS engine 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 High.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","mobile","package"],"not_affected_if":["chrome-updated"],"how_to_check":"- Open Chrome, go to Settings > About Chrome, and read the installed version.\n- Check that the version is `157.0.8103.38` or later.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:06+00:00","first_seen_at":"2026-11-03T21:19:09+00:00","triaged_at":"2026-11-03T21:27:30+00:00","updated_at":"2026-11-03T21:27:30+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-11-03T21:27:30Z","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 CSS lets a crafted page run code","impact":"high","summary":"A use-after-free bug in the CSS engine 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 High.","audience":"everyone","category":"package","nicknames":[],"who_cares":["chrome","browser","desktop","mobile"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox after a user visits a page","analyst_note":"","how_to_check":"- Open Chrome, go to Settings > About Chrome, and read the installed version.\n- Check that the 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-updated"],"who_is_affected":"Any device running Google Chrome before 157.0.8103.38 is exposed when a user opens a malicious web page. Servers and other systems that do not run Chrome as a browser are not affected by this flaw.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000662,"input_tokens":4101,"output_tokens":504,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121036':16A,19A '-2026':15A,18A '157.0.8103.38':39B,72C 'allow':73C 'arbitrari':45B,79C 'attack':43B,76C 'browser':20B,49B 'bug':30B 'chrome':1A,21B,37B,69C 'chromium':56B,89C 'code':13A,46B,80C 'craft':10A,53B,86C 'css':7A,33B,66C 'cve':14A,17A 'desktop':22B 'engin':34B 'execut':78C 'free':5A,29B,64C 'googl':36B,68C 'high':61B,92C 'html':54B,87C 'insid':47B,81C 'let':8A,40B 'mobil':23B 'packag':24B 'page':11A,55B,88C 'prior':70C 'rate':57B 'remot':42B,75C 'run':12A,44B 'sandbox':50B,83C 'secur':59B,90C 'sever':60B,91C 'use':3A,27B,62C 'use-after-fre':2A,26B 'via':51B,84C","nicknames":[],"mitigations":[],"who_affected":"Any device running Google Chrome before 157.0.8103.38 is exposed when a user opens a malicious web page. Servers and other systems that do not run Chrome as a browser are not affected by this flaw.","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","high","mobile","package"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:06+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121036","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121036","severity":null,"published_at":"2026-11-03T21:17:06+00:00","modified_at":"2026-11-03T21:17:06+00:00","first_seen_at":"2026-11-03T21:19:09+00:00","fetched_at":"2026-11-03T21:19:09+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"}