{"id":"CVE-2026-121035","kind":"vulnerability","aliases":["CVE-2026-121035"],"related":[],"title":"Chrome: use-after-free in Prerender lets a web page run code","description":"Use after free in Prerender in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)","summary":"A use-after-free bug in the Prerender feature of Google Chrome lets a crafted HTML page make the browser run attacker code outside its sandbox. The Chromium security team rates it Critical.","severity":"critical","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","endpoints","package"],"not_affected_if":["already-updated"],"how_to_check":"- Open Chrome, go to `chrome://settings/help`, and read the installed version\n- Check that the version is below `157.0.8103.38`, which means the browser is exposed","fix":"- Google Chrome: `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":"2026-11-03T21:27:33+00:00","updated_at":"2026-11-03T21:27:33+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-11-03T21:27:33Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: `157.0.8103.38` or later","reach":"internet","title":"Chrome: use-after-free in Prerender lets a web page run code","impact":"high","summary":"A use-after-free bug in the Prerender feature of Google Chrome lets a crafted HTML page make the browser run attacker code outside its sandbox. The Chromium security team rates it Critical.","audience":"everyone","category":"package","nicknames":[],"who_cares":["chrome","browsers","endpoints"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"Attacker code runs outside the browser sandbox on the user's machine","analyst_note":"Confirm from the Chrome release notes whether the Prerender trigger needs a default or non-default setting and whether exploitation is known in the wild.","how_to_check":"- Open Chrome, go to `chrome://settings/help`, and read the installed version\n- Check that the version is below `157.0.8103.38`, which means the browser is exposed","plain_action":"Update Google Chrome to version 157.0.8103.38 or later: Chrome menu > Help > About Google Chrome.","needs_analyst":true,"not_affected_if":["already-updated"],"who_is_affected":"Any desktop or mobile install of Google Chrome before 157.0.8103.38 is exposed when a user loads a crafted web page. The sources do not say whether Prerender must be triggered by a specific setting or whether a user must visit the page themselves. Teams that manage browsers on employee machines should confirm versions across the fleet.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.0007,"input_tokens":4104,"output_tokens":579,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121035':16A,19A '-2026':15A,18A '157.0.8103.38':68C 'allow':69C 'arbitrari':75C 'attack':46B,72C 'browser':20B,44B 'bug':29B 'chrome':1A,21B,36B,65C 'chromium':52B,85C 'code':13A,47B,76C 'craft':39B,82C 'critic':57B,88C 'cve':14A,17A 'endpoint':22B 'execut':74C 'featur':33B 'free':5A,28B,60C 'googl':35B,64C 'html':40B,83C 'let':8A,37B 'make':42B 'outsid':48B,77C 'packag':23B 'page':11A,41B,84C 'prerend':7A,32B,62C 'prior':66C 'rate':55B 'remot':71C 'run':12A,45B 'sandbox':50B,79C 'secur':53B,86C 'sever':87C 'team':54B 'use':3A,26B,58C 'use-after-fre':2A,25B 'via':80C 'web':10A","nicknames":[],"mitigations":[],"who_affected":"Any desktop or mobile install of Google Chrome before 157.0.8103.38 is exposed when a user loads a crafted web page. The sources do not say whether Prerender must be triggered by a specific setting or whether a user must visit the page themselves. Teams that manage browsers on employee machines should confirm versions across the fleet.","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","critical","endpoints","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-2026-121035","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121035","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"}