Heap-based buffer overflow in Google Chromium - CVE-2026-5869

Vulnerability identifier: #VU125614

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-2026-5869

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 WebML. 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 147.0.7727.55
Microsoft Edge - update to 147.0.3912.60
Google Chrome - update to 147.0.7727.55
chromium - addressed in versions 147.0.7727.55-1.el9, 147.0.7727.55-1.el10_1, 147.0.7727.55-1.el10_2, 147.0.7727.55-1.el10_3, 147.0.7727.55-1.fc42, 147.0.7727.55-1.fc43, 147.0.7727.55-1.fc44, 147.0.7727.101-1.fc42
chromium (Debian package) - addressed in versions 147.0.7727.55-1~deb12u1, 147.0.7727.55-1~deb13u1

• https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html
• https://crbug.com/493708165

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