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CVE-2026-9900 Google CVE debrief

CVE-2026-9900 is an out-of-bounds write vulnerability in ANGLE, the graphics layer used by Google Chrome. The flaw was present in Chrome versions prior to 148.0.7778.216 and carries a Chromium security severity rating of High. Successful exploitation requires an attacker to have already compromised the renderer process, after which a crafted HTML page could be leveraged to potentially escape the Chrome sandbox. The vulnerability was disclosed on May 28, 2026, with the NVD record subsequently modified on May 29, 2026. The underlying weakness is categorized as CWE-787 (Out-of-bounds Write). No known exploitation in ransomware campaigns has been reported, and the vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog.

Vendor
Google
Product
Chrome
CVSS
HIGH 8.3
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 large Chrome deployments, security teams managing browser security posture, and environments where users access untrusted web content should prioritize this patch. The sandbox escape potential elevates risk for endpoints where browser isolation is a critical security control.

Technical summary

The vulnerability exists in ANGLE (Almost Native Graphics Layer Engine), which translates OpenGL ES API calls to platform-specific graphics APIs. An out-of-bounds write condition can be triggered when processing crafted HTML content, potentially allowing an attacker who has already achieved renderer process compromise to escape the Chrome sandbox and execute code with elevated privileges. The fix was released in Chrome 148.0.7778.216.

Defensive priority

high

Recommended defensive actions

  • Upgrade Google Chrome to version 148.0.7778.216 or later to remediate this vulnerability.
  • Prioritize patching on endpoints where users browse untrusted or adversarial web content, given the High severity rating and sandbox escape potential.
  • Monitor for indicators of renderer process compromise, as successful exploitation of this flaw requires prior access to the renderer.
  • Review application control policies to restrict execution of outdated Chrome versions in high-risk environments.

Evidence notes

Vulnerability description and affected version range derived from official Chrome release notes and Chromium issue tracker. CWE-787 classification sourced from NVD metadata. Timeline based on CVE published and modified timestamps per NVD record.

Official resources

2026-05-28