{"id":"CVE-2026-121133","kind":"vulnerability","aliases":["CVE-2026-121133"],"related":[],"title":"Chrome on Mac: image handling flaw lets a compromised renderer escape sandbox","description":"Incorrect reference resolution in Images in Google Chrome on on Mac prior to 157.0.8103.38 allowed a remote attacker who had compromised the renderer process to execute arbitrary code outside the sandbox via crafted network traffic. (Chromium security severity: High)","summary":"Google Chrome on Mac prior to 157.0.8103.38 has an incorrect reference resolution bug in its Images component. A remote attacker who has already compromised the renderer process can run arbitrary code outside the sandbox using crafted network traffic.","severity":"high","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["browser","chrome","macos","runtime"],"not_affected_if":["chrome-updated","non-mac-platforms"],"how_to_check":"- Check the installed Chrome version in Chrome's About page (Chrome menu > Help > About Google Chrome) and compare it to `157.0.8103.38`.","fix":"- Google Chrome on Mac: move to `157.0.8103.38` or later.","status":"open","published_at":"2026-11-03T21:17:21+00:00","first_seen_at":"2026-11-03T21:19:21+00:00","triaged_at":"2026-11-03T21:24:47+00:00","updated_at":"2026-11-03T21:24:47+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-11-03T21:24:47Z","model":"claude-haiku-5-5","output":{"fix":"- Google Chrome on Mac: move to `157.0.8103.38` or later.","reach":"internet","title":"Chrome on Mac: image handling flaw lets a compromised renderer escape sandbox","impact":"high","summary":"Google Chrome on Mac prior to 157.0.8103.38 has an incorrect reference resolution bug in its Images component. A remote attacker who has already compromised the renderer process can run arbitrary code outside the sandbox using crafted network traffic.","audience":"everyone","category":"runtime","nicknames":[],"who_cares":["chrome","macos","browser"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Attacker runs arbitrary code outside the browser sandbox on the machine","analyst_note":"","how_to_check":"- Check the installed Chrome version in Chrome's About page (Chrome menu > Help > About Google Chrome) and compare it to `157.0.8103.38`.\n- unknown for other checks; the sources do not say.","plain_action":"Update Google Chrome on your Mac to version 157.0.8103.38 or later.","needs_analyst":false,"not_affected_if":["chrome-updated","non-mac-platforms"],"who_is_affected":"Only Chrome on macOS builds before 157.0.8103.38 are named in the sources. The exploit requires a renderer compromise first, so the flaw is a sandbox escape step rather than a standalone entry point. Systems running Chrome on other platforms are not named in the sources.","user_interaction":"unknown","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000694,"input_tokens":4121,"output_tokens":563,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-121133':15A,18A '-2026':14A,17A '157.0.8103.38':29B,74C 'allow':75C 'alreadi':45B 'arbitrari':52B,87C 'attack':42B,78C 'browser':19B 'bug':35B 'chrome':1A,20B,24B,68C 'chromium':96C 'code':53B,88C 'compon':39B 'compromis':9A,46B,81C 'craft':58B,93C 'cve':13A,16A 'escap':11A 'execut':86C 'flaw':6A 'googl':23B,67C 'handl':5A 'high':99C 'imag':4A,38B,65C 'incorrect':32B,61C 'let':7A 'mac':3A,26B,71C 'maco':21B 'network':59B,94C 'outsid':54B,89C 'prior':27B,72C 'process':49B,84C 'refer':33B,62C 'remot':41B,77C 'render':10A,48B,83C 'resolut':34B,63C 'run':51B 'runtim':22B 'sandbox':12A,56B,91C 'secur':97C 'sever':98C 'traffic':60B,95C 'use':57B 'via':92C","nicknames":[],"mitigations":[],"who_affected":"Only Chrome on macOS builds before 157.0.8103.38 are named in the sources. The exploit requires a renderer compromise first, so the flaw is a sandbox escape step rather than a standalone entry point. Systems running Chrome on other platforms are not named in the sources.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Google Chrome on your Mac to version 157.0.8103.38 or later.","pkeys":[],"ptokens":[],"labels":["browser","chrome","high","macos","runtime"],"campaign_type":null,"first_public_at":"2026-11-03T21:17:21+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121133","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121133","severity":null,"published_at":"2026-11-03T21:17:21+00:00","modified_at":"2026-11-03T21:17:21+00:00","first_seen_at":"2026-11-03T21:19:21+00:00","fetched_at":"2026-11-03T21:19:21+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"}