CVE-2026-3924
Published: 11 March 2026
Summary
CVE-2026-3924 is a high-severity Use After Free (CWE-416) vulnerability in Google Chrome. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 35.1th 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).
Deeper analysis
CVE-2026-3924 is a use-after-free vulnerability (CWE-416) in the WindowDialog component of Google Chrome versions prior to 146.0.7680.71. This flaw affects the Chromium-based browser's renderer process, where memory is accessed after it has been freed, potentially leading to arbitrary code execution within the compromised process. The issue carries a CVSS v3.1 base score of 7.5 (AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H) and is rated High severity by Chromium security standards.
A remote attacker who has already compromised the renderer process—typically through another vulnerability or user interaction—can exploit this bug via a crafted HTML page to achieve a sandbox escape. Exploitation requires network access, high attack complexity, no privileges, and user interaction (such as visiting a malicious site), but successful compromise grants high impacts on confidentiality, integrity, and availability with unchanged scope.
Mitigation is available through the stable channel update for Google Chrome desktop, detailed in the Chrome Releases blog at https://chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_10.html, which patches the issue in version 146.0.7680.71 and later. Additional technical details and the fix are tracked in the Chromium issue at https://issues.chromium.org/issues/487338366; users should update to the latest version promptly to prevent exploitation.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-11440
Vulnerability details
use after free in WindowDialog in Google Chrome prior to 146.0.7680.71 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Use-after-free in Chrome renderer enables sandbox escape + arbitrary code execution via crafted HTML (drive-by), directly supporting client exploitation (T1203), drive-by compromise (T1189), and privilege escalation out of the sandbox (T1068).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires timely remediation of flaws, directly addressing the use-after-free vulnerability through Chrome patching to version 146.0.7680.71 or later.
Implements memory protection mechanisms such as ASLR and DEP that directly mitigate use-after-free exploits in the renderer process.
Enforces process isolation in the renderer sandbox to limit the scope and impact of potential sandbox escapes triggered by the use-after-free.