CVE-2026-9937Network attack vectorHinoki check available

Sandbox escape via reentrant IME view destruction

Published May 28, 2026 · Updated May 28, 2026

A use-after-free in Google Chrome's Windows UI before 148.0.7778.216 lets remote attackers escape the browser sandbox via crafted HTML. In RenderWidgetHostViewAura::OnBoundsChanged, a synchronous call to a third-party input method can destroy the view, after which the function accesses it again. Exploitation requires a previously compromised renderer and a Windows input-method callout that reenters the browser; the resulting escape crosses the renderer sandbox boundary.

CVSS severity8.3
High
EPSS probability0.22%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A use-after-free in Google Chrome's Windows UI before 148.0.7778.216 lets remote attackers escape the browser sandbox via crafted HTML. In RenderWidgetHostViewAura::OnBoundsChanged, a synchronous call to a third-party input method can destroy the view, after which the function accesses it again. Exploitation requires a previously compromised renderer and a Windows input-method callout that reenters the browser; the resulting escape crosses the renderer sandbox boundary.

The record

CVE
CVE-2026-9937
Published
May 28, 2026
Updated
May 28, 2026
Vendor
WebM Project
Product
Chrome
Classifications
CWE-416, T1068
Attack vector
network
Privileges
Unavailable

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 version<148.0.7778.216

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

WebM Project · Chrome<148.0.7778.216

Published CVSS scores

8.3CISA-ADPCVSS:3.1/AV:N/AC:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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