{"id":"CVE-2026-118346","kind":"vulnerability","aliases":["CVE-2026-118346"],"related":[],"title":"Chrome: use-after-free in compositing lets a crafted page run code","description":"Use after free in Compositing in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)","summary":"Google Chrome before 156.0.8078.73 has a use-after-free bug in its Compositing component. A remote attacker who lures a user to a crafted HTML page can potentially execute arbitrary code inside the browser sandbox.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","managed-fleet","other"],"not_affected_if":["already-updated-to-156.0.8078.73"],"how_to_check":"- Check the installed Chrome version in the browser's About page or with `google-chrome --version` (unknown for managed or other platforms)\n- Confirm whether any managed fleet reports Chrome below `156.0.8078.73`","fix":"- Update Google Chrome to `156.0.8078.73` or later\n- Restart the browser after the update so the fixed version is running","status":"open","published_at":"2026-10-27T23:17:03+00:00","first_seen_at":"2026-10-27T23:29:43+00:00","triaged_at":"2026-10-27T23:31:37+00:00","updated_at":"2026-10-27T23:31:37+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-27T23:31:37Z","model":"claude-haiku-5-5","output":{"fix":"- Update Google Chrome to `156.0.8078.73` or later\n- Restart the browser after the update so the fixed version is running","reach":"internet","title":"Chrome: use-after-free in compositing lets a crafted page run code","impact":"high","summary":"Google Chrome before 156.0.8078.73 has a use-after-free bug in its Compositing component. A remote attacker who lures a user to a crafted HTML page can potentially execute arbitrary code inside the browser sandbox.","category":"other","nicknames":[],"who_cares":["chrome","desktop","browsers","managed-fleet"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox on the user's machine","analyst_note":"","how_to_check":"- Check the installed Chrome version in the browser's About page or with `google-chrome --version` (unknown for managed or other platforms)\n- Confirm whether any managed fleet reports Chrome below `156.0.8078.73`","needs_analyst":false,"not_affected_if":["already-updated-to-156.0.8078.73"],"who_is_affected":"Any user running Google Chrome before `156.0.8078.73` who opens untrusted web pages is exposed, since the attack is delivered through a crafted HTML page. Organizations with managed Chrome fleets should check that the update has reached every machine. Users on up-to-date Chrome releases are not affected.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000592,"input_tokens":3293,"output_tokens":526,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-118346':16A,19A '-2026':15A,18A '156.0.8078.73':29B,72C 'allow':73C 'arbitrari':56B,80C 'attack':43B,76C 'browser':20B,60B 'bug':36B 'chrome':1A,21B,27B,69C 'chromium':90C 'code':13A,57B,81C 'compon':40B 'composit':7A,39B,66C 'craft':10A,50B,87C 'cve':14A,17A 'desktop':22B 'execut':55B,79C 'fleet':25B 'free':5A,35B,64C 'googl':26B,68C 'high':93C 'html':51B,88C 'insid':58B,82C 'let':8A 'lure':45B 'manag':24B 'managed-fleet':23B 'page':11A,52B,89C 'potenti':54B,78C 'prior':70C 'remot':42B,75C 'run':12A 'sandbox':61B,84C 'secur':91C 'sever':92C 'use':3A,33B,62C 'use-after-fre':2A,32B 'user':47B 'via':85C","nicknames":[],"mitigations":[],"who_affected":"Any user running Google Chrome before `156.0.8078.73` who opens untrusted web pages is exposed, since the attack is delivered through a crafted HTML page. Organizations with managed Chrome fleets should check that the update has reached every machine. Users on up-to-date Chrome releases are not affected.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T23:17:03+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118346","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118346","severity":null,"published_at":"2026-10-27T23:17:03+00:00","modified_at":"2026-10-27T23:17:03+00:00","first_seen_at":"2026-10-27T23:29:43+00:00","fetched_at":"2026-10-27T23:29:43+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"}