CVE-2026-9876Public exploitNetwork attack vector

Sandbox escape via premature WebGL query deletion

Published May 28, 2026 · Updated May 28, 2026

Use after free in WebGL in Google Chrome for Android before 148.0.7778.216 allows remote attackers to escape its sandbox via crafted HTML. A crafted WebGL sequence begins an occlusion query, creates a fence, ends the query, and then deletes the query objects while GPU work still retains them. A victim must load attacker-controlled HTML on an affected Android device; the published demonstration reaches code execution in Chrome's privileged GPU process, but no device-level escape is documented.

CVSS severity9.6
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use after free in WebGL in Google Chrome for Android before 148.0.7778.216 allows remote attackers to escape its sandbox via crafted HTML. A crafted WebGL sequence begins an occlusion query, creates a fence, ends the query, and then deletes the query objects while GPU work still retains them. A victim must load attacker-controlled HTML on an affected Android device; the published demonstration reaches code execution in Chrome's privileged GPU process, but no device-level escape is documented.

The record

CVE
CVE-2026-9876
Published
May 28, 2026
Updated
May 28, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=148.0.7778.216 <148.0.7778.216

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=148.0.7778.216 <148.0.7778.216

Published CVSS scores

9.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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