{"id":"CVE-2026-121126","kind":"vulnerability","aliases":["CVE-2026-121126"],"related":[],"title":"Chrome: use-after-free in Core lets a crafted page run code","description":"Use after free in Core in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)","summary":"A memory bug in Chrome's Core component, fixed in 157.0.8103.38, lets a remote attacker serve a crafted HTML page that can execute arbitrary code outside the browser sandbox. Chromium rates it Critical.","severity":"critical","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","linux","macos","runtime","windows"],"not_affected_if":["chrome-at-or-above-157.0.8103.38"],"how_to_check":"- Check the installed Chrome version in chrome://settings/help or with `google-chrome --version`\n- Compare it against `157.0.8103.38`","fix":"- Google Chrome: move to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:20+00:00","first_seen_at":"2026-11-03T21:19:19+00:00","triaged_at":"2026-11-03T21:24:52+00:00","updated_at":"2026-11-03T21:24:52+00:00","category":"runtime","confidence":0.8,"triage":{"at":"2026-11-03T21:24:52Z","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 Core lets a crafted page run code","impact":"high","summary":"A memory bug in Chrome's Core component, fixed in 157.0.8103.38, lets a remote attacker serve a crafted HTML page that can execute arbitrary code outside the browser sandbox. Chromium rates it Critical.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","desktop","browser","windows","macos","linux"],"confidence":0.8,"fix_status":"available","needs_auth":"no","worst_case":"code runs outside the browser sandbox on the user's machine","analyst_note":"Check the Chrome Releases blog for the official fixed-version notice and whether exploitation is known; the NVD entry alone gives no CVSS score.","how_to_check":"- Check the installed Chrome version in chrome://settings/help or with `google-chrome --version`\n- Compare it against `157.0.8103.38`","plain_action":"Update Google Chrome to version 157.0.8103.38 or later.","needs_analyst":true,"not_affected_if":["chrome-at-or-above-157.0.8103.38"],"who_is_affected":"Any machine running Google Chrome before 157.0.8103.38 is exposed when it loads a malicious web page. Managed fleets and kiosks running Chrome are in scope; systems on a browser build that is already at or past the fixed version are not.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"critical"},"cost_usd":0.00069,"input_tokens":4101,"output_tokens":560,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121126':16A,19A '-2026':15A,18A '157.0.8103.38':37B,70C 'allow':71C 'arbitrari':50B,78C 'attack':41B,74C 'browser':20B,54B 'bug':29B 'chrome':1A,21B,31B,67C 'chromium':56B,88C 'code':13A,51B,79C 'compon':34B 'core':7A,33B,64C 'craft':10A,44B,85C 'critic':59B,91C 'cve':14A,17A 'desktop':22B 'execut':49B,77C 'fix':35B 'free':5A,62C 'googl':66C 'html':45B,86C 'let':8A,38B 'linux':23B 'maco':24B 'memori':28B 'outsid':52B,80C 'page':11A,46B,87C 'potenti':76C 'prior':68C 'rate':57B 'remot':40B,73C 'run':12A 'runtim':25B 'sandbox':55B,82C 'secur':89C 'serv':42B 'sever':90C 'use':3A,60C 'use-after-fre':2A 'via':83C 'window':26B","nicknames":[],"mitigations":[],"who_affected":"Any machine running Google Chrome before 157.0.8103.38 is exposed when it loads a malicious web page. Managed fleets and kiosks running Chrome are in scope; systems on a browser build that is already at or past the fixed version are not.","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":["browser","chrome","critical","desktop","linux","macos","runtime","windows"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:20+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121126","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121126","severity":null,"published_at":"2026-11-03T21:17:20+00:00","modified_at":"2026-11-03T21:17:20+00:00","first_seen_at":"2026-11-03T21:19:19+00:00","fetched_at":"2026-11-03T21:19:19+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"}