CVE-2026-9891: Use after free in Extensions
Chromium: CVE-2026-9891 Use after free in Extensions
Other sources
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
— Microsoft
Use after free in Extensions in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted Chrome Extension. (Chromium security severity: Critical)
— NVD
Credit
Affected Software
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2026-9891?
CVE-2026-9891 has a severity rating of critical, with a CVSS score of 9.
How do I fix CVE-2026-9891?
To fix CVE-2026-9891, users should update Google Chrome to version 148.0.7778.216 or later.
What type of vulnerability is CVE-2026-9891?
CVE-2026-9891 is a use after free vulnerability in Google Chrome's Extensions.
Who is affected by CVE-2026-9891?
Users of Google Chrome prior to version 148.0.7778.216 are affected by CVE-2026-9891.
What could an attacker accomplish using CVE-2026-9891?
An attacker exploiting CVE-2026-9891 could potentially perform a sandbox escape through a crafted Chrome Extension.