CVE-2026-10905: Chrome Sandbox Escape via Use-After-Free in Network Code

Technical summary

CVE-2026-10905 is a use-after-free vulnerability (CWE-416) in the Network component of Chromium prior to version 149.0.7827.53. A compromised renderer process can trigger memory corruption through crafted HTML, potentially achieving sandbox escape. The attack surface is remote but requires renderer compromise as a precondition; however, renderer compromises via malicious web content are common in real-world attack chains. The vulnerability earned a Chromium security severity rating of High and a CVSS v3.1 score of 8.3.

Business impact

Successful exploitation transforms a browser compromise into full system compromise. An attacker gains the ability to read sensitive data, modify files, install malware, or pivot to other systems on the network. For organizations, this directly threatens confidential information accessed through Chrome and increases the blast radius of web-based attacks. Users who browse untrusted content face elevated risk of complete system takeover.

Affected systems

Google Chrome versions prior to 149.0.7827.53 are vulnerable. The vulnerability also affects systems running Chrome on Apple macOS, Microsoft Windows, and Linux platforms, as well as Linux kernel environments where Chrome may be deployed. Any environment running an outdated Chrome version is at risk.

Exploitability

Exploitation requires two conditions: first, the attacker must compromise the Chrome renderer process (typically via a malicious webpage or web-based exploit), and second, the user must be tricked into visiting a crafted HTML page. The CVSS vector reflects these constraints (AC:H for attack complexity, UI:R for user interaction required). While not trivially exploitable by unauthenticated remote actors, the attack is feasible in targeted campaigns and poses material risk given the prevalence of renderer exploits in the wild.

Remediation

Update Google Chrome to version 149.0.7827.53 or later. Chrome's auto-update mechanism typically rolls out patches within days; however, users should verify their version under Settings > About to confirm they are running a patched build. For enterprise deployments, enforce Chrome version policies to block outdated releases.

Patch guidance

Google Chrome patches are released regularly through the auto-update channel. Verify your installed version by navigating to Settings > About > Chrome; the browser will check for updates automatically and restart to apply them. Users on managed deployments should coordinate patch schedules with their IT team to ensure timely deployment of version 149.0.7827.53 or later across the organization.

Detection guidance

Monitor Chrome process activity for abnormal memory access patterns or inter-process communication that could indicate sandbox escape attempts. Desktop security tools should alert on processes spawned by Chrome with elevated privileges. Network-level detection is limited; focus on endpoint telemetry to identify post-compromise behavior such as unusual file system access, registry modifications (on Windows), or child process creation. Consider monitoring for indicators of compromise (IoCs) related to known renderer exploits that might precede sandbox escape attacks.

Why prioritize this

This vulnerability merits high priority because it enables sandbox escape—a critical security boundary bypass. Although it requires renderer compromise as a precondition, renderer compromises are relatively common in targeted attacks. Organizations should prioritize patching to eliminate this attack vector, particularly if their users access untrusted web content or high-value web applications. The CVSS score of 8.3 and Chromium's High severity rating reflect the severity of potential impact.

Risk score, explained

The CVSS 3.1 score of 8.3 (HIGH) reflects the combination of network accessibility (AV:N), high attack complexity due to the need for renderer compromise and user interaction (AC:H, UI:R), changed scope (S:C, indicating system-wide impact), and confidentiality, integrity, and availability impacts (C:H, I:H, A:H). The changed scope is particularly significant—it means successful exploitation is not confined to the Chrome process but extends to the underlying operating system. The score appropriately elevates the risk profile due to the sandbox escape dimension.

Frequently asked questions