CVE-2026-3545Network attack vector

Sandbox escape via invalid navigation data

Published Mar 4, 2026 · Updated Mar 4, 2026

Improper input validation in Google Chrome before 145.0.7632.159 allows remote attackers to escape the sandbox via crafted HTML. Google identifies the affected locus only as Navigation; the restricted issue record does not disclose which navigation data is accepted without adequate validation or how it crosses the sandbox boundary. Exploitation requires a user to load the crafted page, and the documented consequence is escape from Chrome's sandbox rather than a separately established host-code-execution primitive.

CVSS severity9.6
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Google Chrome before 145.0.7632.159 allows remote attackers to escape the sandbox via crafted HTML. Google identifies the affected locus only as Navigation; the restricted issue record does not disclose which navigation data is accepted without adequate validation or how it crosses the sandbox boundary. Exploitation requires a user to load the crafted page, and the documented consequence is escape from Chrome's sandbox rather than a separately established host-code-execution primitive.

The record

CVE
CVE-2026-3545
Published
Mar 4, 2026
Updated
Mar 4, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-20, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 4, 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=145.0.7632.159 <145.0.7632.159

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=145.0.7632.159 <145.0.7632.159

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1203Exploitation for Client Execution

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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