{"id":"CVE-2026-121038","kind":"vulnerability","aliases":["CVE-2026-121038"],"related":[],"title":"Google Chrome: compositing flaw leaks cross-origin data from crafted pages","description":"Information leak in Compositing in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to obtain cross-origin data via a crafted HTML page. (Chromium security severity: High)","summary":"A flaw in Chrome's compositing code, prior to 157.0.8103.38, lets a crafted HTML page read data from other websites. Chromium rates it High severity.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","other"],"not_affected_if":["chrome-updated"],"how_to_check":"- Open Chrome, go to `chrome://settings/help` and read the installed version\n- Check the version is `157.0.8103.38` or later","fix":"- Google Chrome: `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:07+00:00","first_seen_at":"2026-11-03T21:19:09+00:00","triaged_at":"2026-11-03T21:27:29+00:00","updated_at":"2026-11-03T21:27:29+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-03T21:27:29Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: `157.0.8103.38` or later","reach":"internet","title":"Google Chrome: compositing flaw leaks cross-origin data from crafted pages","impact":"medium","summary":"A flaw in Chrome's compositing code, prior to 157.0.8103.38, lets a crafted HTML page read data from other websites. Chromium rates it High severity.","audience":"everyone","category":"other","nicknames":[],"who_cares":["chrome","browsers","desktop"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Attacker reads cross-origin data from pages the victim has open.","analyst_note":"","how_to_check":"- Open Chrome, go to `chrome://settings/help` and read the installed version\n- Check the version is `157.0.8103.38` or later","plain_action":"Update Google Chrome to version 157.0.8103.38 or later.","needs_analyst":false,"not_affected_if":["chrome-updated"],"who_is_affected":"Any user running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Exposure is through the browser itself, so managed fleets should check their Chrome build versions.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000636,"input_tokens":4092,"output_tokens":454,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121038':15A,18A '-2026':14A,17A '157.0.8103.38':31B,56C 'allow':57C 'attack':60C 'browser':19B 'chrome':2A,20B,25B,53C 'chromium':42B,72C 'code':28B 'composit':3A,27B,50C 'craft':11A,34B,69C 'cross':7A,64C 'cross-origin':6A,63C 'cve':13A,16A 'data':9A,38B,66C 'desktop':21B 'flaw':4A,23B 'googl':1A,52C 'high':45B,75C 'html':35B,70C 'inform':47C 'leak':5A,48C 'let':32B 'obtain':62C 'origin':8A,65C 'page':12A,36B,71C 'prior':29B,54C 'rate':43B 'read':37B 'remot':59C 'secur':73C 'sever':46B,74C 'via':67C 'websit':41B","nicknames":[],"mitigations":[],"who_affected":"Any user running Google Chrome before 157.0.8103.38 who visits a page an attacker controls. Exposure is through the browser itself, so managed fleets should check their Chrome build versions.","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.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","desktop","high","other"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:07+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121038","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121038","severity":null,"published_at":"2026-11-03T21:17:07+00:00","modified_at":"2026-11-03T21:17:07+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"}