{"id":"CVE-2026-118357","kind":"vulnerability","aliases":["CVE-2026-118357"],"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 potentially 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 victim opens.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","chromium","desktop","runtime"],"not_affected_if":["chrome-156-or-later"],"how_to_check":"- Check the installed Chrome version at chrome://settings/help or with `google-chrome --version` on Linux\n- Check the version reported by managed fleet tooling against `156.0.8078.73`","fix":"- Update Google Chrome to `156.0.8078.73` or later\n- Restart the browser after the update so the new version runs","status":"open","published_at":"2026-10-27T23:17:04+00:00","first_seen_at":"2026-10-27T23:29:44+00:00","triaged_at":"2026-10-27T23:31:27+00:00","updated_at":"2026-10-27T23:31:27+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-27T23:31:27Z","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 new version runs","reach":"internet","title":"Chrome: use-after-free in FileSystem lets a web page run code","impact":"medium","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 victim opens.","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop","chromium"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox via a crafted web page","analyst_note":"Check the Chrome release notes for 156.0.8078.73 and the Chromium bug tracker entry to confirm whether this is exploited in the wild and whether a sandbox escape is chained.","how_to_check":"- Check the installed Chrome version at chrome://settings/help or with `google-chrome --version` on Linux\n- Check the version reported by managed fleet tooling against `156.0.8078.73`","needs_analyst":true,"not_affected_if":["chrome-156-or-later"],"who_is_affected":"Any user or managed device running Google Chrome older than 156.0.8078.73 is exposed when browsing to untrusted pages. Teams that only run Chrome in a locked-down kiosk or do not browse untrusted sites carry less risk, but the fix is the same version bump. Servers and applications built on Chromium-based headless browsers should be checked too.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000626,"input_tokens":3295,"output_tokens":593,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-118357':16A,19A '-2026':15A,18A '156.0.8078.73':39B,73C 'allow':74C 'arbitrari':45B,81C 'attack':43B,52B,77C 'browser':20B,49B 'bug':30B 'chrome':1A,21B,37B,70C 'chromium':22B,91C 'code':13A,46B,82C 'compon':34B 'craft':57B,88C 'cve':14A,17A 'desktop':23B 'execut':80C 'filesystem':7A,33B,67C 'free':5A,29B,65C 'googl':36B,69C 'high':94C 'html':58B,89C 'insid':47B,83C 'let':8A,40B 'open':62B 'page':11A,59B,90C 'potenti':79C 'prior':71C 'remot':42B,76C 'run':12A,44B 'runtim':24B 'sandbox':50B,85C 'secur':92C 'sever':93C 'trigger':54B 'use':3A,27B,63C 'use-after-fre':2A,26B 'via':86C 'victim':61B 'web':10A","nicknames":[],"mitigations":[],"who_affected":"Any user or managed device running Google Chrome older than 156.0.8078.73 is exposed when browsing to untrusted pages. Teams that only run Chrome in a locked-down kiosk or do not browse untrusted sites carry less risk, but the fix is the same version bump. Servers and applications built on Chromium-based headless browsers should be checked too.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-27T23:17:04+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118357","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118357","severity":null,"published_at":"2026-10-27T23:17:04+00:00","modified_at":"2026-10-27T23:17:04+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"}