CVE-2026-17721 in Chrome
Summary
by MITRE • 07/30/2026
Out of bounds write in ANGLE in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical out-of-bounds write flaw within the ANGLE graphics library component that forms part of Google Chrome's rendering architecture. The issue stems from insufficient bounds checking in ANGLE's handling of graphics operations, specifically when processing crafted HTML content that triggers malformed graphics commands. Such vulnerabilities fall under the CWE-787 weakness category, which encompasses out-of-bounds write conditions that can lead to arbitrary code execution and system compromise.
The technical implementation of this vulnerability occurs within Chrome's graphics subsystem where ANGLE translates WebGL and Direct3D operations into native graphics API calls. When a malicious HTML page contains carefully crafted graphics commands or shader code, the ANGLE library fails to properly validate array indices or buffer boundaries during rendering operations. This allows an attacker to write data beyond allocated memory regions, potentially corrupting adjacent memory structures including critical process metadata or sandbox boundary markers.
The operational impact of this vulnerability extends beyond typical browser exploitation vectors due to its potential for sandbox escape capabilities. Modern browsers implement multiple security layers including sandboxing, privilege separation, and memory isolation to prevent malicious code from accessing system resources or other processes. However, an out-of-bounds write in the graphics rendering pipeline can bypass these protections by corrupting memory structures that control process boundaries, effectively allowing attackers to execute arbitrary code with elevated privileges within the browser's restricted environment.
This vulnerability aligns with several ATT&CK tactics including privilege escalation and defense evasion through manipulation of system memory and process structures. The exploitation requires a crafted HTML page delivered through web-based attack vectors such as phishing campaigns or compromised websites, making it particularly dangerous in real-world scenarios where users may inadvertently visit malicious sites. The Chromium security severity rating of High reflects the potential for remote code execution and system compromise that this vulnerability presents to users.
Mitigation strategies should focus on immediate patching of Chrome installations to version 151.0.7922.72 or later, which contains the necessary bounds checking fixes for ANGLE's graphics operations. Additionally, browser security configurations should include enhanced sandboxing parameters, memory protection mechanisms, and regular security updates to prevent exploitation attempts. Organizations should also implement web filtering solutions and user education programs to reduce exposure to malicious web content that could trigger this vulnerability through crafted HTML pages containing malicious graphics commands or WebGL shaders.