{"id":"CVE-2026-121123","kind":"vulnerability","aliases":["CVE-2026-121123"],"related":[],"title":"Chrome: use-after-free in Canvas lets crafted web page run code","description":"Use after free in Canvas 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 memory-handling bug in Chrome's Canvas feature lets a crafted HTML page make the browser run attacker code inside the sandbox. Chromium rates it High severity.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","runtime"],"not_affected_if":["chrome-at-or-above-157.0.8103.38"],"how_to_check":"- Open the Chrome version via the browser's About page or `chrome://version`\n- Check that the version is at or above `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":"2026-11-03T21:24:56+00:00","updated_at":"2026-11-03T21:24:56+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:24:56Z","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 Canvas lets crafted web page run code","impact":"high","summary":"A memory-handling bug in Chrome's Canvas feature lets a crafted HTML page make the browser run attacker code inside the sandbox. Chromium rates it High severity.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browser","desktop"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker code runs inside the browser sandbox after a visit to a page","analyst_note":"","how_to_check":"- Open the Chrome version via the browser's About page or `chrome://version`\n- Check that the version is at or above `157.0.8103.38`","plain_action":"Update Google Chrome to version 157.0.8103.38 or later, then restart the browser.","needs_analyst":false,"not_affected_if":["chrome-at-or-above-157.0.8103.38"],"who_is_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits untrusted web pages. The attack works through a crafted HTML page, so no login is needed, but the code runs only inside the browser sandbox. Chromium-based browsers that pick up the same Chromium fix are likely also exposed; the sources do not say which.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.00067,"input_tokens":4103,"output_tokens":520,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121123':16A,19A '-2026':15A,18A '157.0.8103.38':63C 'allow':64C 'arbitrari':70C 'attack':43B,67C 'browser':20B,41B 'bug':28B 'canva':7A,32B,57C 'chrome':1A,21B,30B,60C 'chromium':48B,80C 'code':13A,44B,71C 'craft':9A,36B,77C 'cve':14A,17A 'desktop':22B 'execut':69C 'featur':33B 'free':5A,55C 'googl':59C 'handl':27B 'high':51B,83C 'html':37B,78C 'insid':45B,72C 'let':8A,34B 'make':39B 'memori':26B 'memory-handl':25B 'page':11A,38B,79C 'prior':61C 'rate':49B 'remot':66C 'run':12A,42B 'runtim':23B 'sandbox':47B,74C 'secur':81C 'sever':52B,82C 'use':3A,53C 'use-after-fre':2A 'via':75C 'web':10A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome before 157.0.8103.38 who visits untrusted web pages. The attack works through a crafted HTML page, so no login is needed, but the code runs only inside the browser sandbox. Chromium-based browsers that pick up the same Chromium fix are likely also exposed; the sources do not say which.","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":["browser","chrome","desktop","high","runtime"],"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-2026-121123","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121123","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"}