[悪用確認] CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability

Google Chromium V8 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. 対応: 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. (期限 2026-09-23)

CISA Known Exploited Vulnerabilitiesで読む

2026/09/09 09:00、CISA Known Exploited Vulnerabilitiesが「[悪用確認] CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「緊急」(critical) です。CVE: CVE-2026-87491。