Heap-based buffer overflow in Google Chromium - CVE-2026-12466

Vulnerability identifier: #VU134719

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-12466

CWE-ID: CWE-122

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 boundary error when processing untrusted HTML content in WebRTC. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

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

Install update from vendor's website.

Google Chromium - update to 149.0.7827.155
Microsoft Edge - update to 149.0.4022.80
Google Chrome - update to 149.0.7827.155
chromium - addressed in versions 149.0.7827.155-1.el9, 149.0.7827.155-1.el10_2, 149.0.7827.155-1.el10_3, 149.0.7827.155-1.fc43, 149.0.7827.155-1.fc44
chromium (Debian package) - addressed in versions 149.0.7827.155-1~deb12u1, 149.0.7827.155-1~deb13u1

• https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_01750511403.html
• https://crbug.com/520199394

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