CVE-2026-5874
Published: 08 April 2026
Summary
CVE-2026-5874 is a critical-severity Use After Free (CWE-416) vulnerability in Google Chrome. Its CVSS base score is 9.6 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 31.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Requires timely identification, reporting, and remediation of flaws like this use-after-free vulnerability through patching Chrome to version 147.0.7727.55 or later.
Implements memory protection safeguards such as ASLR and DEP to directly mitigate use-after-free exploits that could lead to sandbox escape.
Enforces process isolation via sandboxing to limit the scope and impact of vulnerabilities like this PrivateAI sandbox escape attempt.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Use-after-free vulnerability exploited via crafted HTML page with user UI interaction enables arbitrary code execution in client browser (T1203: Exploitation for Client Execution). Leads to sandbox escape, facilitating privilege escalation via exploitation (T1068: Exploitation for Privilege Escalation).
NVD Description
Use after free in PrivateAI in Google Chrome prior to 147.0.7727.55 allowed a remote attacker who convinced a user to engage in specific UI gestures to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)
Deeper analysisAI
CVE-2026-5874 is a use-after-free vulnerability (CWE-416) in the PrivateAI component of Google Chrome prior to version 147.0.7727.55. Published on 2026-04-08, it carries a CVSS v3.1 base score of 9.6 (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H) and is classified as Medium severity by Chromium security.
A remote attacker can exploit this vulnerability by convincing a user to engage in specific UI gestures while visiting a crafted HTML page, potentially achieving a sandbox escape with high confidentiality, integrity, and availability impacts due to the elevated scope.
Mitigation is available via the stable channel update to Google Chrome 147.0.7727.55 or later, as detailed in the Chrome Releases blog at https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html and the Chromium issue tracker at https://issues.chromium.org/issues/485397279. Security practitioners should prioritize updating affected browsers.
Details
- CWE(s)