Use-after-free in Google Chromium - CVE-2026-6299

Vulnerability identifier: #VU126277

CSH Severity: High

CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-6299

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the Prerender component in Google Chrome. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger use-after-free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Google Chromium
Microsoft Edge
Google Chrome
Debian Linux
Fedora
chromium
chromium (Debian package)

Install update from vendor's website.

Google Chromium - update to 147.0.7727.101
Microsoft Edge - addressed in versions 146.0.3856.130, 147.0.3912.72
Google Chrome - update to 147.0.7727.101
chromium - addressed in versions 147.0.7727.101-1.el9, 147.0.7727.101-1.el10_1, 147.0.7727.101-1.el10_2, 147.0.7727.101-1.el10_3, 147.0.7727.101-1.fc42, 147.0.7727.101-1.fc43, 147.0.7727.101-1.fc44
chromium (Debian package) - addressed in versions 147.0.7727.101-1~deb12u1, 147.0.7727.101-1~deb13u1

• https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop_15.html
• https://crbug.com/497053588

• Multiple vulnerabilities in Google Chrome
• Fedora EPEL 10.1 update for chromium
• Fedora EPEL 9 update for chromium
• Fedora EPEL 10.3 update for chromium
• Fedora 44 update for chromium
• Fedora 42 update for chromium
• Fedora EPEL 10.2 update for chromium
• Fedora 43 update for chromium
• Multiple vulnerabilities in Microsoft Edge
• Debian update for chromium