CVE-2026-7917Network attack vector

Sandbox escape via Fullscreen use-after-free

Published May 6, 2026 · Updated May 6, 2026

Use-after-free in Google Chrome Fullscreen before 148.0.7778.96 on Windows allows remote attackers to escape the sandbox via crafted HTML. Google identifies the Fullscreen component but has not disclosed which object is freed too early or later dereferenced; the linked issue remains restricted. Exploitation requires a previously compromised renderer process and user interaction with the crafted page, after which the attacker crosses the renderer sandbox boundary.

CVSS severity8.3
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Google Chrome Fullscreen before 148.0.7778.96 on Windows allows remote attackers to escape the sandbox via crafted HTML. Google identifies the Fullscreen component but has not disclosed which object is freed too early or later dereferenced; the linked issue remains restricted. Exploitation requires a previously compromised renderer process and user interaction with the crafted page, after which the attacker crosses the renderer sandbox boundary.

The record

CVE
CVE-2026-7917
Published
May 6, 2026
Updated
May 6, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-416, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=148.0.7778.96 <148.0.7778.96

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=148.0.7778.96 <148.0.7778.96

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-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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