CVE-2026-11235 in Chrome
Summary
by MITRE • 06/05/2026
Insufficient policy enforcement in Compositing in Google Chrome prior to 149.0.7827.53 allowed a remote attacker who had compromised the renderer process to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 06/05/2026
This vulnerability represents a critical sandbox escape flaw in Google Chrome's compositing subsystem that existed prior to version 149.0.7827.53. The issue stems from insufficient policy enforcement mechanisms within the compositing layer, which is responsible for rendering complex web content and managing graphics operations across multiple processes. When a remote attacker successfully compromises the renderer process through a malicious HTML page, they can exploit this weakness to execute arbitrary code within the sandboxed environment, effectively bypassing the intended security boundaries that separate the renderer from the more privileged sandboxed processes. The vulnerability operates at the intersection of process isolation and graphics rendering, where the compositing component fails to properly validate or enforce security policies that should prevent unauthorized code execution.
The technical flaw manifests in the compositing subsystem's inadequate validation of graphics operations and memory access patterns that occur during page rendering. When the renderer process is compromised, the attacker can manipulate the compositing layer to escalate privileges and execute malicious code within the sandboxed environment where the compositor operates. This represents a breakdown in the security model that relies on process isolation and privilege separation, specifically targeting the Chromium-based browser's architecture where the compositor process runs with reduced privileges but still requires access to graphics resources and memory operations. The vulnerability is classified under CWE-284 Access Control, specifically addressing insufficient enforcement of access control policies within the graphics rendering subsystem. This weakness allows for privilege escalation from a compromised renderer process to a more privileged sandboxed compositor process, creating a path for arbitrary code execution.
The operational impact of this vulnerability is significant as it enables attackers to potentially escalate privileges and execute malicious code with higher privileges than those available in the compromised renderer process. The attack vector requires a pre-existing compromise of the renderer process, which could occur through various means such as drive-by downloads, malicious web content, or other initial access vectors. Once the attacker has control of the renderer, they can craft a specially designed HTML page that exploits the compositing policy enforcement weakness to gain code execution within the sandbox. This vulnerability undermines the fundamental security model of modern browsers that rely on multi-process architectures to isolate different components and prevent privilege escalation. The low severity classification in Chromium's security framework belies the potential for serious exploitation, as it allows for code execution within the sandboxed environment, potentially leading to full system compromise.
Mitigation strategies for this vulnerability involve updating to Chrome version 149.0.7827.53 or later, where the compositing policy enforcement has been strengthened to properly validate graphics operations and prevent unauthorized code execution. Organizations should implement proactive security measures including regular browser updates, network monitoring for suspicious web traffic, and endpoint protection solutions that can detect and block malicious HTML content. The fix addresses the underlying policy enforcement weakness by implementing stricter validation of graphics operations and memory access patterns within the compositing layer, ensuring that only authorized operations can proceed across the process boundaries. Security teams should also consider implementing additional monitoring for unusual graphics-related processes and memory access patterns that could indicate exploitation attempts, aligning with ATT&CK technique T1059 Command and Scripting Interpreter and T1068 Exploitation for Privilege Escalation. Organizations should maintain comprehensive incident response plans that account for potential sandbox escape scenarios and ensure proper patch management protocols are in place to minimize exposure windows.