Use-after-free in WebKitGTK+ and WPE WebKit - CVE-2026-86986
Published: October 27, 2026
Vulnerability identifier: #VU157731
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-86986
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a use-after-free error when processing HTML content in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and crash the browser.
Affected software
WebKitGTK+
WPE WebKit
Apple Safari
macOS
WPE WebKit
Apple Safari
macOS
How to mitigate CVE-2026-86986
Install updates from vendor's website.
Apple Safari - update to 27.2
macOS - update to 27.2 26B123
macOS - update to 27.2 26B123