{"id":"CVE-2026-121117","kind":"vulnerability","aliases":["CVE-2026-121117"],"related":[],"title":"Chrome: use-after-free in Paint lets a crafted web page run code","description":"Use after free in Paint 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 Paint 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 the flaw High severity.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","runtime"],"not_affected_if":["chrome-updated","sandbox-escape-not-needed"],"how_to_check":"- Check the installed Chrome version in Chrome's About page or with `google-chrome --version` on Linux\n- Compare the result with the fixed version `157.0.8103.38`","fix":"- Google Chrome: move to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:19+00:00","first_seen_at":"2026-11-03T21:19:18+00:00","triaged_at":"2026-11-03T21:25:03+00:00","updated_at":"2026-11-03T21:25:03+00:00","category":"runtime","confidence":0.8,"triage":{"at":"2026-11-03T21:25:03Z","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 Paint lets a crafted web page run code","impact":"high","summary":"A use-after-free bug in the Paint 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 the flaw High severity.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"code runs inside the browser sandbox after visiting a page","analyst_note":"","how_to_check":"- Check the installed Chrome version in Chrome's About page or with `google-chrome --version` on Linux\n- Compare the result with the fixed version `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","sandbox-escape-not-needed"],"who_is_affected":"Anyone running Google Chrome older than 157.0.8103.38 who opens a malicious or compromised web page can be exposed. Managed fleets and other Chromium-based browsers that share the Paint code should be checked separately. Users who keep Chrome current and do not visit untrusted pages face less exposure.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000688,"input_tokens":4101,"output_tokens":555,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121117':17A,20A '-2026':16A,19A '157.0.8103.38':39B,72C 'allow':73C 'arbitrari':45B,79C 'attack':43B,76C 'browser':21B,49B 'bug':30B 'chrome':1A,22B,37B,69C 'chromium':56B,89C 'code':14A,46B,80C 'compon':34B 'craft':10A,53B,86C 'cve':15A,18A 'desktop':23B 'execut':78C 'flaw':59B 'free':5A,29B,64C 'googl':36B,68C 'high':60B,92C 'html':54B,87C 'insid':47B,81C 'let':8A,40B 'page':12A,55B,88C 'paint':7A,33B,66C 'prior':70C 'rate':57B 'remot':42B,75C 'run':13A,44B 'runtim':24B 'sandbox':50B,83C 'secur':90C 'sever':61B,91C 'use':3A,27B,62C 'use-after-fre':2A,26B 'via':51B,84C 'web':11A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome older than 157.0.8103.38 who opens a malicious or compromised web page can be exposed. Managed fleets and other Chromium-based browsers that share the Paint code should be checked separately. Users who keep Chrome current and do not visit untrusted pages face less exposure.","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","desktop","high","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:19+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121117","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121117","severity":null,"published_at":"2026-11-03T21:17:19+00:00","modified_at":"2026-11-03T21:17:19+00:00","first_seen_at":"2026-11-03T21:19:18+00:00","fetched_at":"2026-11-03T21:19:18+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"}