{"id":"CVE-2025-6554","kind":"vulnerability","aliases":["CVE-2025-6554"],"related":[],"title":"Type confusion in V8 in Google Chrome prior to 138.0.7204.96 allowed a remote attacker to perform arbitrary…","description":"Google Chromium V8 contains a type confusion vulnerability that could allow a remote attacker to perform arbitrary read/write via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"Chromium's V8 JavaScript engine has a type confusion bug that lets a remote attacker read and write arbitrary memory by serving a crafted HTML page. CISA lists it as actively exploited in the wild.","severity":"high","cvss":8.1,"epss":null,"exploited":true,"exploited_at":"2025-07-02T00:00:00+00:00","products":[{"name":"Google Chromium V8","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"google chrome","fixed":["138.0.7204.96"],"affected":"< 138.0.7204.96","ecosystem":"vendor"},{"name":"google chrome","fixed":["138.0.7204.92"],"affected":"< 138.0.7204.92","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["browser-users","chrome","chromium","edge","exploited","opera","runtime"],"not_affected_if":["already-patched-browser"],"how_to_check":"Open chrome://version (or edge://version, opera://version) and compare the version against the vendor fix; unknown for the exact fixed build in the sources.","fix":"Update Google Chrome, Microsoft Edge, Opera or other Chromium browsers to the vendor's patched release; unknown for the exact build number in the sources.","status":"open","published_at":"2025-06-30T22:15:29+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:46:49+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"runtime","confidence":0.8,"triage":{"at":"2026-10-23T20:46:49Z","model":"claude-haiku-5-5","output":{"fix":"Update Google Chrome, Microsoft Edge, Opera or other Chromium browsers to the vendor's patched release; unknown for the exact build number in the sources.","reach":"internet","summary":"Chromium's V8 JavaScript engine has a type confusion bug that lets a remote attacker read and write arbitrary memory by serving a crafted HTML page. CISA lists it as actively exploited in the wild.","category":"runtime","who_cares":["chromium","chrome","edge","opera","browser-users"],"confidence":0.8,"needs_auth":"no","worst_case":"Attacker reads and writes arbitrary browser memory, enabling code execution after visiting a page.","analyst_note":"Find the patched Chrome stable build number and the Google Chrome Releases advisory for CVE-2025-6554 to fill in how_to_check and fix.","how_to_check":"Open chrome://version (or edge://version, opera://version) and compare the version against the vendor fix; unknown for the exact fixed build in the sources.","needs_analyst":true,"not_affected_if":["already-patched-browser"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000465,"input_tokens":2583,"output_tokens":413,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':131C '-2025':19A,22A '-6554':20A,23A '138.0.7204.96':10A '22':130C 'action':121C 'activ':70B 'affect':101C 'allow':11A,85C 'appli':122C 'applic':128C 'arbitrari':17A,58B,91C 'attack':14A,54B,88C 'bod':129C 'browser':32B,104C 'browser-us':31B 'bug':49B 'chrome':7A,28A,30A,34B,114C 'chromium':25A,35B,40B,76C,107C 'cisa':66B,119C 'cloud':134C 'confus':2A,48B,81C 'contain':78C 'could':84C,100C 'craft':63B,95C 'cve':18A,21A 'discontinu':137C 'edg':36B,116C 'engin':44B 'exploit':37B,71B 'follow':127C 'googl':6A,75C,113C 'google':24A,27A,29A 'guidanc':132C 'html':64B,96C 'includ':108C 'instruct':126C 'javascript':43B 'let':51B 'limit':111C 'list':67B 'memori':59B 'microsoft':115C 'mitig':123C,143C 'multipl':102C 'opera':38B,118C 'page':65B,97C 'per':124C 'perform':16A,90C 'prior':8A 'product':141C 'read':55B 'read/write':92C 'remot':13A,53B,87C 'requir':120C 'runtim':39B 'serv':61B 'servic':135C 'type':1A,47B,80C 'unavail':145C 'use':138C 'user':33B 'util':106C 'v8':4A,26A,42B,77C 'vendor':125C 'via':93C 'vulner':82C,99C 'web':103C 'wild':74B 'write':57B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2025-06-30T22:15:29+00:00","kev":{"dateAdded":"2025-07-02","dueDate":"2025-07-23","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","cvss_by":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-6554","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-6554","severity":null,"published_at":"2025-07-02T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T15:39:40+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-6554","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-6554","severity":null,"published_at":"2025-06-30T22:15:29+00:00","modified_at":"2026-06-17T10:02:08+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+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"}