{"id":"CVE-2026-121188","kind":"vulnerability","aliases":["CVE-2026-121188"],"related":[],"title":"Chrome: use-after-free in PerformanceAPIs lets a web page run code","description":"Use after free in PerformanceAPIs 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 PerformanceAPIs component of Google Chrome before 157.0.8103.38 lets a remote attacker run arbitrary code inside the browser sandbox. The attack is triggered by a crafted HTML page that the victim opens.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","runtime"],"not_affected_if":["chrome-updated"],"how_to_check":"- Open Chrome's About page (`chrome://version`) and read the version number.\n- Confirm the installed version is `157.0.8103.38` or later.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:27+00:00","first_seen_at":"2026-11-03T21:19:25+00:00","triaged_at":"2026-11-03T21:23:01+00:00","updated_at":"2026-11-03T21:23:01+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:23:01Z","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 PerformanceAPIs lets a web page run code","impact":"high","summary":"A use-after-free bug in the PerformanceAPIs component of Google Chrome before 157.0.8103.38 lets a remote attacker run arbitrary code inside the browser sandbox. The attack is triggered by a crafted HTML page that the victim opens.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"code runs inside the browser sandbox on the victim's machine","analyst_note":"Check the Chrome release notes and the Chromium bug entry for CVE-2026-121188 to confirm the fixed version and whether a sandbox escape has been reported.","how_to_check":"- Open Chrome's About page (`chrome://version`) and read the version number.\n- Confirm the installed version is `157.0.8103.38` or later.","plain_action":"Update Google Chrome to version 157.0.8103.38 or later, then restart the browser.","needs_analyst":true,"not_affected_if":["chrome-updated"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits a malicious or compromised web page. The sources do not describe any server-side or enterprise-only exposure, so the risk is mainly to desktop and mobile browser users.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000694,"input_tokens":4107,"output_tokens":567,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121188':16A,19A '-2026':15A,18A '157.0.8103.38':38B,73C 'allow':74C 'arbitrari':44B,80C 'attack':42B,51B,77C 'browser':20B,48B 'bug':29B 'chrome':1A,21B,36B,70C 'chromium':90C 'code':13A,45B,81C 'compon':33B 'craft':56B,87C 'cve':14A,17A 'desktop':22B 'execut':79C 'free':5A,28B,65C 'googl':35B,69C 'high':93C 'html':57B,88C 'insid':46B,82C 'let':8A,39B 'open':62B 'page':11A,58B,89C 'performanceapi':7A,32B,67C 'prior':71C 'remot':41B,76C 'run':12A,43B 'runtim':23B 'sandbox':49B,84C 'secur':91C 'sever':92C 'trigger':53B 'use':3A,26B,63C 'use-after-fre':2A,25B 'via':85C 'victim':61B 'web':10A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits a malicious or compromised web page. The sources do not describe any server-side or enterprise-only exposure, so the risk is mainly to desktop and mobile browser users.","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, then restart the browser.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","desktop","high","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:27+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121188","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121188","severity":null,"published_at":"2026-11-03T21:17:27+00:00","modified_at":"2026-11-03T21:17:27+00:00","first_seen_at":"2026-11-03T21:19:25+00:00","fetched_at":"2026-11-03T21:19:25+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"}