Use of Uninitialized Variable in Google Chrome - CVE-2026-9963

Vulnerability identifier: #VU132946

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-2026-9963

CWE-ID: CWE-457

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to use of an uninitialized variable in iOS. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.

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

Install updates from vendor's website.

Google Chrome - update to 148.0.7778.215
Microsoft Edge - update to 148.0.3967.97
chromium - addressed in versions 148.0.7778.215-1.el9, 148.0.7778.215-1.el10_2, 148.0.7778.215-1.el10_3, 148.0.7778.215-1.fc43, 148.0.7778.215-1.fc44
chromium (Debian package) - addressed in versions 148.0.7778.215-1~deb12u1, 148.0.7778.215-1~deb13u1

• https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
• https://issues.chromium.org/issues/505143241

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