{"id":"CVE-2026-118347","kind":"vulnerability","aliases":["CVE-2026-118347"],"related":[],"title":"Chrome: use-after-free in FileSystem lets a web page run code","description":"Use after free in FileSystem in Google Chrome prior to 156.0.8078.73 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 FileSystem component of Google Chrome before 156.0.8078.73 lets a remote attacker run arbitrary code inside the browser sandbox. The attack is triggered by a crafted HTML page the user opens.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop","endpoints","runtime"],"not_affected_if":["chrome-up-to-date"],"how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `google-chrome --version` on Linux.\n- Confirm whether the version is below `156.0.8078.73`.","fix":"- Update Google Chrome to `156.0.8078.73` or later.\n- Relaunch the browser after the update so the fix takes effect.","status":"open","published_at":"2026-10-27T23:17:03+00:00","first_seen_at":"2026-10-27T23:29:44+00:00","triaged_at":"2026-10-27T23:31:34+00:00","updated_at":"2026-10-27T23:31:34+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-27T23:31:34Z","model":"claude-haiku-5-5","output":{"fix":"- Update Google Chrome to `156.0.8078.73` or later.\n- Relaunch the browser after the update so the fix takes effect.","reach":"internet","title":"Chrome: use-after-free in FileSystem lets a web page run code","impact":"high","summary":"A use-after-free bug in the FileSystem component of Google Chrome before 156.0.8078.73 lets a remote attacker run arbitrary code inside the browser sandbox. The attack is triggered by a crafted HTML page the user opens.","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop","endpoints"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox after a user visits a page","analyst_note":"","how_to_check":"- Open Chrome and check the version under Settings > About Chrome, or run `google-chrome --version` on Linux.\n- Confirm whether the version is below `156.0.8078.73`.","needs_analyst":false,"not_affected_if":["chrome-up-to-date"],"who_is_affected":"Any machine running Google Chrome before 156.0.8078.73 is exposed when a user visits a malicious or compromised web page. Managed fleets and users who browse the open web are the main concern. Systems that do not run Chrome can skip it.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000578,"input_tokens":3296,"output_tokens":496,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-118347':16A,19A '-2026':15A,18A '156.0.8078.73':39B,73C 'allow':74C 'arbitrari':45B,80C 'attack':43B,52B,77C 'browser':20B,49B 'bug':30B 'chrome':1A,21B,37B,70C 'chromium':90C 'code':13A,46B,81C 'compon':34B 'craft':57B,87C 'cve':14A,17A 'desktop':22B 'endpoint':23B 'execut':79C 'filesystem':7A,33B,67C 'free':5A,29B,65C 'googl':36B,69C 'high':93C 'html':58B,88C 'insid':47B,82C 'let':8A,40B 'open':62B 'page':11A,59B,89C 'prior':71C 'remot':42B,76C 'run':12A,44B 'runtim':24B 'sandbox':50B,84C 'secur':91C 'sever':92C 'trigger':54B 'use':3A,27B,63C 'use-after-fre':2A,26B 'user':61B 'via':85C 'web':10A","nicknames":[],"mitigations":[],"who_affected":"Any machine running Google Chrome before 156.0.8078.73 is exposed when a user visits a malicious or compromised web page. Managed fleets and users who browse the open web are the main concern. Systems that do not run Chrome can skip it.","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-2026-118347","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118347","severity":null,"published_at":"2026-10-27T23:17:03+00:00","modified_at":"2026-10-27T23:17:03+00:00","first_seen_at":"2026-10-27T23:29:44+00:00","fetched_at":"2026-10-27T23:29:44+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"}