Description
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)
Published: 2026-10-02
Score: 9.6 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Immediate Patch
AI Analysis

Impact

A use‑after‑free flaw in the FedCM implementation of Google Chrome allows a remote attacker to execute arbitrary code outside the browser sandbox through a crafted HTML page. The vulnerability, rated high by Chromium, could compromise confidentiality, integrity, and availability of the affected system if an unprivileged web page triggers the exploit.

Affected Systems

Google Chrome users who have not upgraded to version 154.0.8037.97 or later are affected. The flaw exists in all prior releases of Chrome and can impact any user visiting a site that can deliver a malicious HTML payload to the browser.

Risk and Exploitability

The vulnerability carries a high severity rating with a CVSS score of 9.6. The EPSS score is < 1%, and the vulnerability is not listed in CISA’s KEV catalog. However, the potential for remote code execution outside the sandbox underscores a significant risk if an attacker can deliver a crafted page to the user. The likely attack vector is a remotely hosted malicious website that triggers the use‑after‑free condition during FedCM processing.

Generated by OpenCVE AI on October 7, 2026 at 07:54 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Update Google Chrome to version 154.0.8037.97 or later.
  • If an upgrade cannot be performed immediately, disable the FedCM feature by launching Chrome with the flag --disable-features=FedCM or by setting the corresponding experimental flag to off through chrome://flags.
  • Avoid visiting untrusted websites that could supply malicious HTML and use a strict content‑security policy to limit script execution if possible.

Generated by OpenCVE AI on October 7, 2026 at 07:54 UTC.

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4833-1 chromium security update
Debian DSA Debian DSA DSA-6553-1 chromium security update
History

Thu, 08 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
Title chromium-browser: Use after free in FedCM
References
Metrics threat_severity

None

 threat_severity

Important

Wed, 07 Oct 2026 08:15:00 +0000

Type Values Removed Values Added
Title Use after Free in FedCM Enables Remote Code Execution in Google Chrome

Tue, 06 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*

Tue, 06 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Fri, 02 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Google
Google chrome
Vendors & Products Google
Google chrome

Fri, 02 Oct 2026 18:15:00 +0000

Type Values Removed Values Added
Title Use after Free in FedCM Enables Remote Code Execution in Google Chrome

Fri, 02 Oct 2026 16:15:00 +0000

Type Values Removed Values Added
Description 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)
Weaknesses CWE-416
References

Subscriptions

Google Chrome
cve-icon MITRE

Status: PUBLISHED

Assigner: Chrome

Published:

Updated: 2026-10-06T13:09:20.834Z

Reserved: 2026-09-30T23:12:22.943Z

Link: CVE-2026-103630

cve-icon Vulnrichment

Updated: 2026-10-06T13:09:17.266Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-02T16:16:44.150

Modified: 2026-10-06T16:22:17.147

Link: CVE-2026-103630

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-02T16:07:54Z

Links: CVE-2026-103630 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-07T08:00:12Z

Weaknesses