{"id":"CVE-2026-121055","kind":"vulnerability","aliases":["CVE-2026-121055"],"related":[],"title":"Chrome: DevTools cleanup flaw lets a crafted extension bypass access limits","description":"Incomplete cleanup in DevTools in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass system access restrictions via a crafted Chrome extension. (Chromium security severity: Low)","summary":"Google Chrome's DevTools did not fully clean up after itself, so a crafted Chrome extension can get around system access restrictions. Chromium rates it Low severity.","severity":"low","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser-extensions","chrome","desktop","package"],"not_affected_if":["chrome-updated","no-untrusted-extensions"],"how_to_check":"- Check the Chrome version under chrome://settings/help and compare it with `157.0.8103.38`\n- Review installed extensions at chrome://extensions for ones you do not recognize","fix":"- Google Chrome: move to `157.0.8103.38` or later","status":"open","published_at":"2026-11-03T21:17:10+00:00","first_seen_at":"2026-11-03T21:19:10+00:00","triaged_at":"2026-11-03T21:27:12+00:00","updated_at":"2026-11-03T21:27:12+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-03T21:27:12Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later","reach":"local","title":"Chrome: DevTools cleanup flaw lets a crafted extension bypass access limits","impact":"medium","summary":"Google Chrome's DevTools did not fully clean up after itself, so a crafted Chrome extension can get around system access restrictions. Chromium rates it Low severity.","audience":"everyone","category":"package","nicknames":[],"who_cares":["chrome","browser-extensions","desktop"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"Malicious extension bypasses system access restrictions in the browser","analyst_note":"","how_to_check":"- Check the Chrome version under chrome://settings/help and compare it with `157.0.8103.38`\n- Review installed extensions at chrome://extensions for ones you do not recognize","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","no-untrusted-extensions"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who has installed an extension that could be crafted to exploit this. Exposure depends on the browser version and the extensions installed; the sources do not describe a server-side path.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000669,"input_tokens":4106,"output_tokens":516,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121055':14A,17A '-2026':13A,16A '157.0.8103.38':60C 'access':10A,44B,68C 'allow':61C 'around':42B 'attack':64C 'browser':19B 'browser-extens':18B 'bypass':9A,66C 'chrome':1A,21B,25B,38B,57C,73C 'chromium':46B,75C 'clean':31B 'cleanup':3A,52C 'craft':7A,37B,72C 'cve':12A,15A 'desktop':22B 'devtool':2A,27B,54C 'extens':8A,20B,39B,74C 'flaw':4A 'fulli':30B 'get':41B 'googl':24B,56C 'incomplet':51C 'let':5A 'limit':11A 'low':49B,78C 'packag':23B 'prior':58C 'rate':47B 'remot':63C 'restrict':45B,69C 'secur':76C 'sever':50B,77C 'system':43B,67C 'via':70C","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who has installed an extension that could be crafted to exploit this. Exposure depends on the browser version and the extensions installed; the sources do not describe a server-side path.","tier":"C","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":["browserextensions","chrome","desktop","low","package"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:10+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121055","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121055","severity":null,"published_at":"2026-11-03T21:17:10+00:00","modified_at":"2026-11-03T21:17:10+00:00","first_seen_at":"2026-11-03T21:19:10+00:00","fetched_at":"2026-11-03T21:19:10+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"}