CVE-2026-12454Network attack vector

Sandbox escape via Safe Browsing race

Published Jun 17, 2026 · Updated Jun 17, 2026

Race condition in Safe Browsing in Google Chrome before 149.0.7827.155 allows remote attackers to escape the browser sandbox via crafted HTML. Google has not disclosed the affected Safe Browsing code path or the competing operations that create the race, and the Chromium issue remains access-restricted. Exploitation requires user interaction and prior compromise of the renderer process; successful use crosses the macOS sandbox boundary under the browser user's host context.

CVSS severity8.3
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Safe Browsing in Google Chrome before 149.0.7827.155 allows remote attackers to escape the browser sandbox via crafted HTML. Google has not disclosed the affected Safe Browsing code path or the competing operations that create the race, and the Chromium issue remains access-restricted. Exploitation requires user interaction and prior compromise of the renderer process; successful use crosses the macOS sandbox boundary under the browser user's host context.

The record

CVE
CVE-2026-12454
Published
Jun 17, 2026
Updated
Jun 17, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-362, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 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=149.0.7827.155 <149.0.7827.155

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=149.0.7827.155 <149.0.7827.155

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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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