CVE-2026-103630: Use after free in FedCM

Q: What does an attacker need to exploit this issue?

The attacker needs to cause a user to load a crafted HTML page. Successful exploitation can allow arbitrary code execution outside Chrome's sandbox.

Q: Which Chrome versions are affected?

Google Chrome versions prior to 154.0.8037.97 are affected. Updating to version 154.0.8037.97 or later addresses the affected version range.

Published Sep 4, 2026

Updated

Use after free in FedCM in Google Chrome prior to 154.0.8037.97 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)

Credit

xinyang

Affected Software

2 affected componentsFixes available

Google Chrome<154.0.8037.97

154.0.8037.97

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 154.0.8037.97

Event History

Sep 4, 2026

CVE Published

12:00 AM

Data Sourced

12:00 AM

SeverityWeaknessAffected Software

Oct 2, 2026

CVE Published

via MITRE·04:07 PM

Data Sourced

via MITRE·04:07 PM

DescriptionWeakness

Data Sourced

via NVD·04:16 PM

DescriptionWeakness

Parent advisories

This vulnerability appears in the following advisories.

6766445691312943866

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What does an attacker need to exploit this issue?

The attacker needs to cause a user to load a crafted HTML page. Successful exploitation can allow arbitrary code execution outside Chrome's sandbox.

Which Chrome versions are affected?

Google Chrome versions prior to 154.0.8037.97 are affected. Updating to version 154.0.8037.97 or later addresses the affected version range.

CVE-2026-103630: Use after free in FedCM

Credit

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What does an attacker need to exploit this issue?

Which Chrome versions are affected?

Company

Resources

Contact

Frequently Asked Questions

What does an attacker need to exploit this issue?

Which Chrome versions are affected?