PatchSiren cyber security CVE debrief

CVE-2026-9918 Google CVE debrief

A sandbox escape vulnerability in Google Chrome's Tint component, rated High severity by Chromium security, was disclosed on May 28, 2026. The flaw stems from inappropriate implementation in Tint and could allow a remote attacker to escape the browser sandbox via a crafted HTML page. Chrome versions prior to 148.0.7778.216 are affected. The vulnerability was addressed in the stable channel update released May 28, 2026. No known exploitation in ransomware campaigns has been reported. Organizations should prioritize updating Chrome installations to version 148.0.7778.216 or later.

Vendor: Google
Product: Chrome
CVSS: CRITICAL 9.6
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-05-28
Original CVE updated: 2026-05-29
Advisory published: 2026-05-28
Advisory updated: 2026-05-29

Who should care

Organizations with Chrome deployments, security teams managing browser security, endpoint protection administrators, and users relying on Chrome's sandbox for malware containment.

Technical summary

CVE-2026-9918 is an inappropriate implementation vulnerability in Google Chrome's Tint component that enables sandbox escape. The vulnerability allows remote attackers to break out of Chrome's sandbox protection through malicious HTML content. Chrome versions before 148.0.7778.216 are vulnerable. The fix was released in the stable channel update on May 28, 2026.

Defensive priority

high

Recommended defensive actions

Update Google Chrome to version 148.0.7778.216 or later across all endpoints
Verify Chrome auto-update policies are enabled and functioning
Monitor for unexpected browser process behavior or sandbox escape indicators
Review endpoint detection coverage for Chrome-based exploitation attempts

Evidence notes

Vulnerability description and affected versions confirmed via Chrome Releases blog and Chromium issue tracker. CVE published by NVD on 2026-05-28T23:16:49.897Z, modified 2026-05-29T02:35:42.620Z.

Official resources

2026-05-28