{"id":"CVE-2026-126840","kind":"vulnerability","aliases":["CVE-2026-126840"],"related":[],"title":"Google Chrome: out-of-bounds write in Network lets a web page run code","description":"Out of bounds write in Network in Google Chrome prior to 157.0.8103.78 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)","summary":"A memory write past the end of a buffer in Chrome's Network component lets a crafted HTML page run 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","end-users","other"],"not_affected_if":["chrome-157.0.8103.78-or-later"],"how_to_check":"- Open Chrome and go to `chrome://settings/help` to read the installed version\n- Confirm the version is `157.0.8103.78` or later","fix":"- Google Chrome: move to `157.0.8103.78` or later","status":"open","published_at":"2026-11-11T23:17:11+00:00","first_seen_at":"2026-11-11T23:29:35+00:00","triaged_at":"2026-11-11T23:33:50+00:00","updated_at":"2026-11-11T23:33:50+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-11T23:33:50Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: move to `157.0.8103.78` or later","reach":"internet","title":"Google Chrome: out-of-bounds write in Network lets a web page run code","impact":"high","summary":"A memory write past the end of a buffer in Chrome's Network component lets a crafted HTML page run code inside the browser sandbox. Chromium rates it High severity.","audience":"everyone","category":"other","nicknames":[],"who_cares":["chrome","browsers","end-users"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox via a crafted page","analyst_note":"","how_to_check":"- Open Chrome and go to `chrome://settings/help` to read the installed version\n- Confirm the version is `157.0.8103.78` or later","plain_action":"Update Google Chrome to version 157.0.8103.78 or later: Chrome menu > Help > About Google Chrome.","product_name":"","needs_analyst":false,"not_affected_if":["chrome-157.0.8103.78-or-later"],"who_is_affected":"Any Google Chrome install older than 157.0.8103.78 is exposed when a user opens a crafted web page. Exploitation needs no account, but the attacker must get the user to load the page. Chromium-based browsers that have not yet picked up the Chromium fix may also be exposed, which the sources do not state.","user_interaction":"yes","product_ecosystem":"","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000713,"input_tokens":4527,"output_tokens":520,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-126840':18A,21A '-2026':17A,20A '157.0.8103.78':68C 'allow':69C 'arbitrari':75C 'attack':72C 'bound':6A,59C 'browser':22B,50B 'buffer':35B 'chrome':2A,23B,37B,65C 'chromium':52B,85C 'code':15A,47B,76C 'compon':40B 'craft':43B,82C 'cve':16A,19A 'end':25B,32B 'end-us':24B 'execut':74C 'googl':1A,64C 'high':55B,88C 'html':44B,83C 'insid':48B,77C 'let':10A,41B 'memori':28B 'network':9A,39B,62C 'out-of-bound':3A 'page':13A,45B,84C 'past':30B 'prior':66C 'rate':53B 'remot':71C 'run':14A,46B 'sandbox':51B,79C 'secur':86C 'sever':56B,87C 'user':26B 'via':80C 'web':12A 'write':7A,29B,60C","nicknames":[],"mitigations":[],"who_affected":"Any Google Chrome install older than 157.0.8103.78 is exposed when a user opens a crafted web page. Exploitation needs no account, but the attacker must get the user to load the page. Chromium-based browsers that have not yet picked up the Chromium fix may also be exposed, which the sources do not state.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome to version 157.0.8103.78 or later: Chrome menu > Help > About Google Chrome.","pkeys":[],"ptokens":[],"labels":["browsers","chrome","endusers","high","other"],"campaign_type":null,"search_a":"'-126840':18A,21A '-2026':17A,20A 'bound':6A 'chrome':2A 'code':15A 'cve':16A,19A 'googl':1A 'let':10A 'network':9A 'out-of-bound':3A 'page':13A 'run':14A 'web':12A 'write':7A","search_b":"'browser':22B,50B 'buffer':35B 'chrome':23B,37B 'chromium':52B 'code':47B 'compon':40B 'craft':43B 'end':25B,32B 'end-us':24B 'high':55B 'html':44B 'insid':48B 'let':41B 'memori':28B 'network':39B 'page':45B 'past':30B 'rate':53B 'run':46B 'sandbox':51B 'sever':56B 'user':26B 'write':29B","search_c":"'157.0.8103.78':68C 'allow':69C 'arbitrari':75C 'attack':72C 'bound':59C 'chrome':65C 'chromium':85C 'code':76C 'craft':82C 'execut':74C 'googl':64C 'high':88C 'html':83C 'insid':77C 'network':62C 'page':84C 'prior':66C 'remot':71C 'sandbox':79C 'secur':86C 'sever':87C 'via':80C 'write':60C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-11T23:17:11+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-126840","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126840","severity":null,"published_at":"2026-11-11T23:17:11+00:00","modified_at":"2026-11-11T23:17:11+00:00","first_seen_at":"2026-11-11T23:29:35+00:00","fetched_at":"2026-11-11T23:29:35+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}