{"id":"CVE-2026-121112","kind":"vulnerability","aliases":["CVE-2026-121112"],"related":[],"title":"Chrome: out-of-bounds read in Permissions lets a compromised renderer escape","description":"Out of bounds read in Permissions in Google Chrome prior to 157.0.8103.38 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)","summary":"A flaw in the Permissions component of Google Chrome lets code that has already compromised the renderer process read memory out of bounds. An attacker who gets there via a crafted HTML page could potentially run code outside the browser sandbox.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","endpoints","runtime"],"not_affected_if":["chrome-at-or-above-157.0.8103.38"],"how_to_check":"- Check the Chrome version in the browser's About page or with `chrome://version`; affected builds are prior to `157.0.8103.38`.\n- Check managed fleets for the Chrome version reported by the endpoint management tool.","fix":"- Google Chrome: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:18+00:00","first_seen_at":"2026-11-03T21:19:15+00:00","triaged_at":"2026-11-03T21:25:08+00:00","updated_at":"2026-11-03T21:25:08+00:00","category":"runtime","confidence":0.75,"triage":{"at":"2026-11-03T21:25:08Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: out-of-bounds read in Permissions lets a compromised renderer escape","impact":"high","summary":"A flaw in the Permissions component of Google Chrome lets code that has already compromised the renderer process read memory out of bounds. An attacker who gets there via a crafted HTML page could potentially run code outside the browser sandbox.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browser","endpoints"],"confidence":0.75,"fix_status":"available","needs_auth":"no","worst_case":"Attacker code runs outside the browser sandbox on the user's machine","analyst_note":"","how_to_check":"- Check the Chrome version in the browser's About page or with `chrome://version`; affected builds are prior to `157.0.8103.38`.\n- Check managed fleets for the Chrome version reported by the endpoint management tool.","plain_action":"Update Google Chrome to version 157.0.8103.38 or later.","needs_analyst":false,"not_affected_if":["chrome-at-or-above-157.0.8103.38"],"who_is_affected":"Any desktop or mobile install of Google Chrome before 157.0.8103.38 is in scope, since the attack starts from a web page the browser loads. Chromium-based browsers that pick up the same fix are in scope too, and the sources do not say which ones. The attack needs a renderer compromise first, so the exposure is mainly for users who browse untrusted sites.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000699,"input_tokens":4115,"output_tokens":574,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121112':16A,19A '-2026':15A,18A '157.0.8103.38':76C 'allow':77C 'alreadi':37B 'arbitrari':90C 'attack':48B,80C 'bound':5A,46B,67C 'browser':20B,63B 'chrome':1A,21B,32B,73C 'chromium':100C 'code':34B,60B,91C 'compon':29B 'compromis':11A,38B,83C 'could':57B 'craft':54B,97C 'cve':14A,17A 'endpoint':22B 'escap':13A 'execut':89C 'flaw':25B 'get':50B 'googl':31B,72C 'high':103C 'html':55B,98C 'let':9A,33B 'memori':43B 'out-of-bound':2A 'outsid':61B,92C 'page':56B,99C 'permiss':8A,28B,70C 'potenti':58B,88C 'prior':74C 'process':41B,86C 'read':6A,42B,68C 'remot':79C 'render':12A,40B,85C 'run':59B 'runtim':23B 'sandbox':64B,94C 'secur':101C 'sever':102C 'via':52B,95C","nicknames":[],"mitigations":[],"who_affected":"Any desktop or mobile install of Google Chrome before 157.0.8103.38 is in scope, since the attack starts from a web page the browser loads. Chromium-based browsers that pick up the same fix are in scope too, and the sources do not say which ones. The attack needs a renderer compromise first, so the exposure is mainly for users who browse untrusted sites.","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","endpoints","high","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:18+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121112","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121112","severity":null,"published_at":"2026-11-03T21:17:18+00:00","modified_at":"2026-11-03T21:17:18+00:00","first_seen_at":"2026-11-03T21:19:15+00:00","fetched_at":"2026-11-03T21:19:15+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"}