vulnerabilityCVE-2026-87491

Google Chromium V8 Out of Bounds Write Vulnerability

CVE-2026-87491 is an out-of-bounds write vulnerability in the Chrome V8 JavaScript and WebAssembly engine. Remote attackers can exploit it through crafted HTML pages to execute arbitrary code inside the browser sandbox; successful exploitation may also expose sensitive memory or cause a crash. Google reported that an exploit exists in the wild and released patched Chrome versions for Windows, macOS, and Linux.

Severity

8.8High

Exploitation evidence

Has exploited

Remediation

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.

Affected software

Software	Affected versions	Fixed in	Sources

CVSS (Common Vulnerability Scoring System)

Preferred assessment

Vector

Attack vector

Attack complexity

Privileges required

User interaction

Scope

Confidentiality impact

Integrity impact

Availability impact

Source assessments

EPSS (Exploit Prediction Scoring System)

Probability

Percentile

Model

Preferred remediation

Action