CVE-2026-9918Network attack vectorHinoki check available

Sandbox escape via Tint implementation error

Published May 28, 2026 · Updated May 28, 2026

An implementation error in Tint in Google Chrome before 148.0.7778.216 allows remote attackers to escape the browser sandbox via crafted HTML. Google has not disclosed the specific Tint operation that mishandles the page or how it crosses the sandbox boundary; the linked issue is inaccessible. Exploitation requires a user to load the crafted page, and the published record does not establish a specific host-level effect.

CVSS severity9.6
Critical
EPSS probability0.24%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

An implementation error in Tint in Google Chrome before 148.0.7778.216 allows remote attackers to escape the browser sandbox via crafted HTML. Google has not disclosed the specific Tint operation that mishandles the page or how it crosses the sandbox boundary; the linked issue is inaccessible. Exploitation requires a user to load the crafted page, and the published record does not establish a specific host-level effect.

The record

CVE
CVE-2026-9918
Published
May 28, 2026
Updated
May 28, 2026
Vendor
WebM Project
Product
Chrome
Classifications
CWE-269, T1068
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 version<148.0.7778.216

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WebM Project · Chrome<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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
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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