{"id":"CVE-2026-121047","kind":"vulnerability","aliases":["CVE-2026-121047"],"related":[],"title":"Chrome: media buffer overflow lets a crafted web page run code","description":"Buffer overflow in Media in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)","summary":"A buffer overflow in the Media component of Google Chrome before 157.0.8103.38 lets a remote attacker run arbitrary code inside the browser sandbox when the victim opens a crafted HTML page. Chromium rates it High severity.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","desktop","managed-fleet","runtime"],"not_affected_if":["chrome-up-to-date"],"how_to_check":"- Check the installed Chrome version by opening `chrome://settings/help` or running `google-chrome --version` on Linux.\n- Compare the result against `157.0.8103.38`; anything lower is affected.","fix":"- Google Chrome: update to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:09+00:00","first_seen_at":"2026-11-03T21:19:10+00:00","triaged_at":"2026-11-03T21:27:21+00:00","updated_at":"2026-11-03T21:27:21+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-03T21:27:21Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome: update to `157.0.8103.38` or later.","reach":"internet","title":"Chrome: media buffer overflow lets a crafted web page run code","impact":"high","summary":"A buffer overflow in the Media component of Google Chrome before 157.0.8103.38 lets a remote attacker run arbitrary code inside the browser sandbox when the victim opens a crafted HTML page. Chromium rates it High severity.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","browser","desktop","managed-fleet"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Attacker runs code inside the browser sandbox after a visit","analyst_note":"","how_to_check":"- Check the installed Chrome version by opening `chrome://settings/help` or running `google-chrome --version` on Linux.\n- Compare the result against `157.0.8103.38`; anything lower is affected.","plain_action":"Update Google Chrome to version 157.0.8103.38 or later; Chrome normally updates itself, so restart the browser after it downloads.","needs_analyst":false,"not_affected_if":["chrome-up-to-date"],"who_is_affected":"Anyone running Google Chrome older than 157.0.8103.38 who visits a web page an attacker controls or has tampered with. Managed fleets running Chrome should confirm the browser version on each machine. Chromium-based browsers that pick up Chromium's media code may also need their own updates, which the sources do not confirm.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000696,"input_tokens":4105,"output_tokens":571,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121047':14A,17A '-2026':13A,16A '157.0.8103.38':36B,70C 'allow':71C 'arbitrari':42B,77C 'attack':40B,74C 'browser':18B,46B 'buffer':3A,26B,61C 'chrome':1A,19B,34B,67C 'chromium':56B,87C 'code':11A,43B,78C 'compon':31B 'craft':7A,53B,84C 'cve':12A,15A 'desktop':20B 'execut':76C 'fleet':23B 'googl':33B,66C 'high':59B,90C 'html':54B,85C 'insid':44B,79C 'let':5A,37B 'manag':22B 'managed-fleet':21B 'media':2A,30B,64C 'open':51B 'overflow':4A,27B,62C 'page':9A,55B,86C 'prior':68C 'rate':57B 'remot':39B,73C 'run':10A,41B 'runtim':24B 'sandbox':47B,81C 'secur':88C 'sever':60B,89C 'via':82C 'victim':50B 'web':8A","nicknames":[],"mitigations":[],"who_affected":"Anyone running Google Chrome older than 157.0.8103.38 who visits a web page an attacker controls or has tampered with. Managed fleets running Chrome should confirm the browser version on each machine. Chromium-based browsers that pick up Chromium's media code may also need their own updates, which the sources do not confirm.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome to version 157.0.8103.38 or later; Chrome normally updates itself, so restart the browser after it downloads.","pkeys":[],"ptokens":[],"labels":["browser","chrome","desktop","high","managedfleet","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:09+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121047","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121047","severity":null,"published_at":"2026-11-03T21:17:09+00:00","modified_at":"2026-11-03T21:17:09+00:00","first_seen_at":"2026-11-03T21:19:10+00:00","fetched_at":"2026-11-03T21:19:10+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"}