Out-of-bounds write in Google Chromium - CVE-2026-15903

Vulnerability identifier: #VU138108

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-2026-15903

CWE-ID: CWE-787

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 V8. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds write and execute arbitrary code on the target system.

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

Install update from vendor's website.

Google Chromium - update to 150.0.7871.128
Microsoft Edge - update to 150.0.4078.83
Google Chrome - update to 150.0.7871.128
chromium - addressed in versions 150.0.7871.128-1.el9, 150.0.7871.128-1.el10_2, 150.0.7871.128-1.el10_3, 150.0.7871.128-1.fc43, 150.0.7871.128-1.fc44
chromium (Debian package) - update to 150.0.7871.181-1~deb13u1
Prisma Access Browser - update to 150.49.8.187

• https://chromereleases.googleblog.com/2026/07/stable-channel-update-for-desktop_049796704.html
• https://crbug.com/531503216

• Multiple vulnerabilities in Google Chrome
• Multiple vulnerabilities in Microsoft Edge
• Fedora EPEL 9 update for chromium
• Fedora EPEL 10.2 update for chromium
• Fedora 43 update for chromium
• Fedora 44 update for chromium
• Fedora EPEL 10.3 update for chromium
• Debian update for chromium
• Multiple vulnerabilities in Prisma Access Browser (August 2026)