CVE-2026-12449: Google Chrome Privilege Escalation Flaw

CVE-2026-12449 Overview

CVE-2026-12449 is a use-after-free vulnerability [CWE-416] in the Chromoting component of Google Chrome on Windows. The flaw affects Chrome versions prior to 149.0.7827.155. A local attacker can trigger the condition by delivering a malicious file to the target system. Successful exploitation enables OS-level privilege escalation on the Windows host. Google rates the Chromium security severity as High.

Chromoting is the underlying technology behind Chrome Remote Desktop, which makes this issue relevant to environments that rely on remote assistance or remote workstation access through Chrome.

Critical Impact
Local attackers can escalate to OS-level privileges on Windows endpoints running vulnerable Chrome builds, gaining the ability to execute code outside the browser sandbox.

Affected Products

Google Chrome for Windows prior to 149.0.7827.155
Microsoft Windows hosts running the affected Chrome builds
Deployments using Chrome Remote Desktop (Chromoting) functionality

Discovery Timeline

2026-06-17 - CVE-2026-12449 published to NVD
2026-06-18 - Last updated in NVD database

Technical Details for CVE-2026-12449

Vulnerability Analysis

The vulnerability is a use-after-free condition in Chromoting, the remote desktop component bundled with Google Chrome. Use-after-free flaws occur when code continues to reference memory after it has been released back to the allocator. An attacker who controls the contents of the freed region can influence object state and redirect execution flow.

In this case, the issue is reachable on Windows through a malicious file delivered to the local system. The attacker requires user interaction, which aligns with workflows where a user opens or processes a crafted file. Successful exploitation moves the attacker from a constrained user context to OS-level privileges on the host.

The Common Weakness Enumeration classification is [CWE-416] Use After Free. The bug is tracked in the Chromium issue tracker under issue 513480539.

Root Cause

The root cause is improper lifetime management of an object in the Chromoting code path on Windows. After the object is freed, a dangling reference remains reachable. Subsequent operations that dereference this pointer operate on memory that may have been reallocated and populated with attacker-influenced data. This allows the attacker to corrupt program state in a way that yields elevated privileges.

Attack Vector

The attack vector is local and requires user interaction. An attacker first delivers a malicious file to the target. When the file is processed in a path that reaches the vulnerable Chromoting logic, the use-after-free is triggered. Because Chromoting components on Windows operate with privileges that exceed those of a standard browser tab, exploitation results in OS-level privilege escalation rather than a sandbox-only compromise.

No public proof-of-concept exploit is listed in the enriched data, and the vulnerability is not present in the CISA Known Exploited Vulnerabilities catalog at the time of publication. Refer to the Chromium Issue Tracker Entry and the Google Chrome Update Announcement for additional technical context.

Detection Methods for CVE-2026-12449

Indicators of Compromise

Chrome processes (chrome.exe) spawning child processes that execute with elevated tokens shortly after handling a user-delivered file.
Unexpected creation, modification, or loading of Chromoting-related binaries such as remoting_host.exe or remoting_native_messaging_host.exe.
Crash dumps referencing Chromoting modules followed by privileged process activity on the same host.

Detection Strategies

Inventory installed Chrome versions across Windows endpoints and flag any build below 149.0.7827.155.
Hunt for anomalous parent-child relationships where Chrome or Chromoting host processes launch administrative tools, cmd.exe, or powershell.exe.
Correlate file-open events with subsequent privilege changes on the same endpoint within a short time window.

Monitoring Recommendations

Enable telemetry for Windows process creation (Event ID 4688) with command-line auditing across endpoints.
Monitor Chrome auto-update status and alert on hosts that remain on outdated builds for more than the patch SLA window.
Track usage of Chrome Remote Desktop in the environment and align monitoring with the populations most likely to load Chromoting components.

How to Mitigate CVE-2026-12449

Immediate Actions Required

Update Google Chrome on all Windows endpoints to version 149.0.7827.155 or later.
Verify that Chrome auto-update is enabled and not blocked by group policy or network egress restrictions.
Restrict execution of untrusted files delivered through email, messaging, or external storage on Windows endpoints.

Patch Information

Google addressed the vulnerability in Chrome Stable channel build 149.0.7827.155 for Windows. Patch details and channel notes are available in the Google Chrome Update Announcement. Administrators managing Chrome through enterprise policy should validate that the updated build has been deployed via tools such as Chrome Browser Cloud Management or their existing software distribution platform.

Workarounds

Disable or uninstall Chrome Remote Desktop on systems that do not require remote access through Chromoting.
Apply application control policies to block execution of unsigned or unexpected binaries in user-writable directories.
Limit standard user permissions so that downstream actions following exploitation have reduced lateral impact.

bash

# Verify installed Chrome version on Windows via PowerShell
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion

# Force Chrome update check through the policy-managed update client
& "C:\Program Files (x86)\Google\Update\GoogleUpdate.exe" /ua /installsource scheduler