CVE-2026-11203 in Chrome
Summary
by MITRE • 06/05/2026
Inappropriate implementation in GPU in Google Chrome on Mac prior to 149.0.7827.53 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 06/05/2026
This vulnerability represents a cross-origin data leakage issue within the graphics processing unit implementation of Google Chrome on macOS systems. The flaw exists in the GPU subsystem's handling of cross-origin resource access, where insufficient validation mechanisms allow malicious actors to exploit improper memory management or access control within the graphics rendering pipeline. The vulnerability specifically affects Chrome versions prior to 149.0.7827.53, indicating a targeted security gap in the graphics processing component that was subsequently addressed through patch updates. The security severity classification as Medium reflects the potential for unauthorized data exposure across different origin boundaries while maintaining that the attack vector requires specific conditions and crafted malicious content.
The technical implementation flaw stems from inadequate isolation mechanisms within the GPU process that handles graphics rendering operations. When processing crafted HTML pages containing malicious WebGL or other graphics-related content, the GPU subsystem fails to properly enforce cross-origin restrictions that should normally prevent one website from accessing resources or memory belonging to another origin. This allows an attacker to construct specific HTML pages that can trigger memory access patterns or buffer operations that reveal information from other domains or origins. The vulnerability leverages the graphics processing unit's capabilities to bypass traditional web security boundaries, exploiting the complex interaction between browser rendering engines and hardware acceleration components.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables remote attackers to potentially extract sensitive data from cross-origin contexts. Attackers can craft malicious web pages that, when loaded in Chrome on macOS, trigger GPU operations that leak memory contents or rendering data from other websites. This could include access to user session information, personal data, or other sensitive resources that should normally be protected by the same-origin policy. The remote nature of the attack means that victims need only visit a compromised website to be affected, making this vulnerability particularly dangerous in phishing campaigns or compromised websites.
Mitigation strategies for this vulnerability require immediate application of the security patch released by Google for Chrome version 149.0.7827.53 and subsequent updates. Organizations should implement comprehensive browser update policies to ensure all systems receive security patches promptly. Additionally, network administrators can deploy web application firewalls or content filtering solutions to block access to known malicious domains, though this provides only partial protection as the vulnerability exists within the browser itself. Security monitoring should include detection of unusual GPU activity patterns or memory access operations that might indicate exploitation attempts. From a defense-in-depth perspective, organizations should consider implementing browser hardening measures such as disabling unnecessary graphics features, restricting WebGL access, and maintaining strict access controls for sensitive data environments. This vulnerability aligns with CWE-200 (Information Exposure) and may map to ATT&CK techniques involving information gathering and credential access through browser-based exploitation methods.