CVE-2026-13844: Chrome Updater Use-After-Free Leads to Windows Privilege Escalation

Technical summary

CVE-2026-13844 is a use-after-free (CWE-416) memory safety flaw residing in the Chrome Updater on Windows. The vulnerability arises when the updater processes a specially crafted file, leading to access of freed memory. Because the updater component often runs with elevated privileges or in a security context that can interact with OS-level processes, exploitation can result in arbitrary code execution with higher privileges than the Chrome browser itself. The attack requires local system access and user interaction (opening a malicious file), but no additional privileges are needed from the attacker's initial position.

Business impact

Successful exploitation enables complete system compromise on Windows machines running vulnerable Chrome versions. An attacker can execute arbitrary code with OS-level privileges, potentially stealing sensitive data, installing persistent malware, or disrupting business operations. For organizations where Chrome is widely deployed on employee or contractor workstations, this vulnerability creates a direct path from user action to full system control, bypassing application-level security boundaries.

Affected systems

Google Chrome on Microsoft Windows versions prior to 150.0.7871.47 are affected. The vulnerability does not impact Chrome on macOS, Linux, or Android, nor does it affect other Chromium-based browsers unless they have independently integrated the vulnerable updater code. Windows systems running Chrome versions 150.0.7871.46 and earlier should be considered at risk.

Exploitability

Exploitability is moderate in a real-world sense: an attacker must first convince a user to open a malicious file, which requires social engineering or prior system compromise. However, once user interaction occurs, the technical barrier to exploitation is low—the flaw is triggered reliably through the malicious file, and the privilege escalation is deterministic given the vulnerable code path. No additional exploitation aids, public POC code, or active exploitation in the wild have been reported as of the publication date, though this is a recent disclosure.

Remediation

Update Google Chrome to version 150.0.7871.47 or later. Chrome's automatic update mechanism will push this version to users, but IT administrators should verify deployment on managed Windows endpoints. For organizations managing Chrome through group policy or mobile device management (MDM), confirm that update policies are enabled and that rollout has completed before considering the vulnerability mitigated. No workarounds exist; patching is required.

Patch guidance

Verify that Chrome has auto-updated to version 150.0.7871.47 or later by navigating to Chrome > Settings > About Chrome, which will display the current version and trigger an immediate update check if a newer version is available. In enterprise environments, confirm via your endpoint management console that the patch version has been deployed to all Windows devices running Chrome. Test functionality in a representative subset of endpoints before confirming organization-wide remediation. No manual installation steps are typically required for end users if auto-update is enabled (the default).

Detection guidance

Monitor Windows Event Logs on systems running Chrome for signs of process creation with unexpected privilege levels or unusual child processes spawned by the Chrome Updater (updater.exe). Endpoint Detection and Response (EDR) solutions should flag any execution of code by the updater with access to sensitive OS functions or registry modifications. Network-level detection is unlikely to be effective for local exploitation, so focus detection efforts on host-based indicators of compromise and post-exploitation behavior. Patch verification via inventory management tools is the primary detection method to confirm whether systems remain vulnerable.

Why prioritize this

This vulnerability merits high priority due to its direct path to OS-level privilege escalation on Windows, combined with its ease of exploitation once user interaction occurs. The CVSS 7.8 (High) reflects the severity: local attack vector, low complexity, no special privileges required for the attacker, and high impact across confidentiality, integrity, and availability. While it requires user interaction, the consequences of exploitation are severe. Organizations should prioritize patching within 1–2 weeks to minimize the window during which widespread malware campaigns could target this flaw.

Risk score, explained

The CVSS 3.1 score of 7.8 (High) is driven by: (1) Local attack vector—the attacker must have access to the Windows system; (2) Low complexity—no special conditions or race conditions are required; (3) No privileges required—the attacker starts as an unprivileged user; (4) User interaction required—a user must open a malicious file, limiting script-based mass exploitation but not eliminating risk in targeted campaigns; (5) High impact on all three CIA triad components—successful exploitation grants OS-level code execution, enabling theft of data, system manipulation, and denial of service. The score appropriately reflects a serious but not network-accessible threat.

Frequently asked questions