{"cve":{"cve_id":"CVE-2026-87491","is_kev":true,"kev_date_added":"2026-09-09","kev_vendor_project":"Google","kev_product":"Chromium V8","kev_vulnerability_name":"Google Chromium V8 Out of Bounds Write Vulnerability","kev_short_description":"Google Chromium V8 contains an out of bounds write vulnerability that allows a remote attacker to execute arbitrary code inside the sandbox 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.","kev_required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","kev_due_date":"2026-09-23","kev_known_ransomware":false,"kev_notes":"https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-87491 ","kev_cwes":["CWE-787"],"epss_score":0.00997,"epss_percentile":0.60837,"epss_as_of":"2026-09-15","description":"Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)","published_at":"2026-09-09T00:09:38.419000Z","last_modified_at":"2026-09-10T12:49:02.630000Z","cvss_v3_score":8.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-787"],"nvd_references":["https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html","https://issues.chromium.org/issues/543557673"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-09-09T01:37:54.191367Z","updated_at":"2026-09-12T00:50:23.299559Z"},"effective_severity":"HIGH","badges":["kev","news"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"google","vendor_name":"Google","product_slug":"chrome","product_name":"Chrome","version_start":"153.0.8010.36","version_start_inclusive":true,"version_end":"153.0.8010.36","version_end_inclusive":false,"cpe23_uri":"cve5:google:chrome:153.0.8010.36:153.0.8010.36"},{"vendor_slug":"google","vendor_name":"Google","product_slug":"chrome","product_name":"Chrome","version_start":null,"version_start_inclusive":null,"version_end":"153.0.8010.36","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[{"id":1770,"source":"The Hacker News","url":"https://thehackernews.com/2026/09/chrome-v8-zero-day-exploited-in-wild.html","title":"Chrome V8 Zero-Day Exploited in the Wild Enables Code Execution Inside Sandbox","summary":"Google on Thursday released updates to patch 230 security vulnerabilities, including one that has come under active exploitation in the wild.\n\nThe medium-severity vulnerability, assigned the CVE identifier CVE-2026-87491 (CVSS score: N/A), has been described as an out-of-bounds bug in V8, Chrome's JavaScript and WebAssembly engine.\n\n\"Out-of-bounds write in V8 in Google Chrome prior to","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZvl2DE9GFM-4rdFgtQOOp1Dk3Xgp7xWysUv5zKTFwxqWYTurcgXgE-PDMn3_2AAIihh4YeiRvmwpb6GVDB1-8kxqasUWwX-FFa4mA41kXpFbzdt9hOvzW4xcyKBFttqIzbFSl-1SSSO0P_URv3Sy9QamkQZ55qzX5Y9Kmv5NdBCBHXCcUziiO6mfrqURE/s1600/chrome-zeroday.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-09-09T09:11:03Z","fetched_at":"2026-09-09T09:20:54.573224Z","trending_score":0.02495228033994007,"cve_ids":["CVE-2026-87491"]}],"references":[{"url":"https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html","source_type":"MISC","tags":[]},{"url":"https://issues.chromium.org/issues/543557673","source_type":"MISC","tags":[]}],"timeline":[{"type":"cisa_reported","at":"2026-09-09T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"published","at":"2026-09-09T00:09:38.419000Z","label":"CVE published","source":null},{"type":"first_article","at":"2026-09-09T09:11:03Z","label":"First news coverage","source":"The Hacker News"},{"type":"cvss_changed","at":"2026-09-09T10:37:54.209080Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-09-09T10:37:54.209080Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-09-09T10:37:54.209080Z","label":"CVSS score revised","source":"cvelistv5"}]}