CVE-2026-5290Network attack vector

Sandbox escape via Compositing use-after-free

Published Apr 1, 2026 · Updated Apr 1, 2026

Use-after-free in Google Chrome Compositing before 146.0.7680.178 allows remote attackers with renderer control to escape the sandbox. Compositing accesses freed memory while processing crafted page content, but the restricted Chromium issue does not disclose the object or code path. Exploitation requires crafted HTML and prior compromise of the renderer process; the flaw is a second-stage escape rather than the initial compromise.

CVSS severity9.6
Critical
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in Google Chrome Compositing before 146.0.7680.178 allows remote attackers with renderer control to escape the sandbox. Compositing accesses freed memory while processing crafted page content, but the restricted Chromium issue does not disclose the object or code path. Exploitation requires crafted HTML and prior compromise of the renderer process; the flaw is a second-stage escape rather than the initial compromise.

The record

CVE
CVE-2026-5290
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-416, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=146.0.7680.178 <146.0.7680.178

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=146.0.7680.178 <146.0.7680.178

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1189Drive-by Compromise

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo