{"id":"CVE-2026-118343","kind":"vulnerability","aliases":["CVE-2026-118343"],"related":[],"title":"Chrome: ReadingList input validation flaw lets a crafted page run code","description":"Improper input validation in ReadingList 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 mishandles input in its ReadingList feature, so a crafted HTML page can potentially execute arbitrary code inside the browser sandbox. Chromium rates it High severity.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browsers","chrome","desktop-fleet","runtime"],"not_affected_if":["chrome-updated"],"how_to_check":"- Check the installed Chrome version in the browser's About page or with `google-chrome --version` on Linux\n- Compare the version against `156.0.8078.73`; anything older is affected","fix":"- Update Google Chrome to `156.0.8078.73` or later\n- Relaunch the browser after the update so the new build is active","status":"open","published_at":"2026-10-27T23:17:03+00:00","first_seen_at":"2026-10-27T23:29:43+00:00","triaged_at":"2026-10-27T23:31:39+00:00","updated_at":"2026-10-27T23:31:39+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-27T23:31:39Z","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 new build is active","reach":"internet","title":"Chrome: ReadingList input validation flaw lets a crafted page run code","impact":"medium","summary":"Google Chrome before 156.0.8078.73 mishandles input in its ReadingList feature, so a crafted HTML page can potentially execute arbitrary code inside the browser sandbox. Chromium rates it High severity.","category":"runtime","nicknames":[],"who_cares":["chrome","browsers","desktop-fleet"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code inside the Chrome sandbox via a crafted page","analyst_note":"Confirm from the Chrome release notes whether ReadingList must be enabled for exploitation and whether a sandbox escape is also needed; the NVD entry gives no CVSS score.","how_to_check":"- Check the installed Chrome version in the browser's About page or with `google-chrome --version` on Linux\n- Compare the version against `156.0.8078.73`; anything older is affected","needs_analyst":true,"not_affected_if":["chrome-updated"],"who_is_affected":"Any machine running Google Chrome older than 156.0.8078.73 is exposed when a user visits a crafted web page. Managed fleets and personal browsers both need the update; the sources do not say whether the ReadingList feature must be enabled for the flaw to be reachable.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000607,"input_tokens":3296,"output_tokens":555,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-118343':14A,17A '-2026':13A,16A '156.0.8078.73':27B,63C 'allow':64C 'arbitrari':42B,71C 'attack':67C 'browser':18B,46B 'chrome':1A,19B,25B,60C 'chromium':48B,81C 'code':11A,43B,72C 'craft':8A,36B,78C 'cve':12A,15A 'desktop':21B 'desktop-fleet':20B 'execut':41B,70C 'featur':33B 'flaw':5A 'fleet':22B 'googl':24B,59C 'high':51B,84C 'html':37B,79C 'improp':53C 'input':3A,29B,54C 'insid':44B,73C 'let':6A 'mishandl':28B 'page':9A,38B,80C 'potenti':40B,69C 'prior':61C 'rate':49B 'readinglist':2A,32B,57C 'remot':66C 'run':10A 'runtim':23B 'sandbox':47B,75C 'secur':82C 'sever':52B,83C 'valid':4A,55C 'via':76C","nicknames":[],"mitigations":[],"who_affected":"Any machine running Google Chrome older than 156.0.8078.73 is exposed when a user visits a crafted web page. Managed fleets and personal browsers both need the update; the sources do not say whether the ReadingList feature must be enabled for the flaw to be reachable.","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-2026-118343","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118343","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"}