CVE-2026-121229 in Chrome
Summary
by MITRE • 11/03/2026
Memory corruption in ANGLE in Google Chrome on on Android prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified within the ANGLE graphics library component of Google Chrome on Android represents a critical memory corruption flaw that undermines the browser's core security architecture. ANGLE serves as an abstraction layer that translates OpenGL ES API calls into native platform-specific graphics APIs, such as Vulkan or Metal, allowing web content to render complex 2D and 3D visuals efficiently. The specific defect involves improper handling of memory operations during these translation processes, leading to conditions where buffer boundaries are not correctly validated before data is written. This lack of rigorous bounds checking allows for heap-based corruption, which can manifest as out-of-bounds writes or use-after-free scenarios depending on the precise state of the graphics pipeline at the time of exploitation. Because this flaw resides in a component that processes content from web pages, it creates a direct attack vector where malicious actors do not need physical access to the device but rather rely solely on network delivery mechanisms.
From an operational perspective, the ability for a remote attacker to execute arbitrary code outside the sandbox is particularly severe because it bypasses one of the most important defenses in modern browser security: process isolation and privilege separation. Chrome relies heavily on its multi-process architecture to contain potential exploits within restricted sandboxes that limit access to sensitive system resources, user data, and other processes. When a vulnerability allows execution outside this confined environment, an attacker gains elevated privileges equivalent to those of the application itself or potentially higher, depending on how the exploit chain progresses through kernel-level vulnerabilities or additional privilege escalation techniques. This capability enables full device compromise, including the theft of sensitive information such as login credentials, financial data, and personal communications stored locally on the Android device. The severity rating of Critical reflects this high potential for impact, acknowledging that successful exploitation leads to a complete loss of confidentiality, integrity, and availability for the affected system.
The technical nature of this flaw aligns with common weaknesses found in low-level graphics processing code, specifically categorized under CWE-120 Buffer Copy without Checking Size of Input or CWE-787 Out-of-bounds Write depending on the exact memory state during exploitation. These types of errors are prevalent in C and C++ applications where manual memory management is required, and they remain difficult to eliminate entirely despite modern static analysis tools and fuzzing efforts. The vulnerability was likely triggered by a specially crafted HTML page containing malicious JavaScript or WebGL shaders that manipulate ANGLE's internal structures in unexpected ways. By exploiting the race conditions or logic errors within the graphics driver interface, an attacker can corrupt memory metadata such as heap chunk headers or function pointers, thereby redirecting control flow to injected shellcode. This scenario is consistent with ATT&CK technique T1203 Exploitation for Client Execution, where adversaries use client-side software vulnerabilities to gain initial access and establish a foothold on the target system without requiring user interaction beyond visiting a malicious website.
Mitigation strategies primarily focus on timely patching and defense-in-depth measures. Users must update Google Chrome to version 157.0.8103.38 or later, which contains code changes that enforce stricter memory validation checks within ANGLE's translation layers. Until patches are applied, administrators can mitigate risk by disabling WebGL support in the browser settings if it is not strictly necessary for their workflow, thereby removing the attack surface associated with graphics rendering vulnerabilities. Additionally, enabling Chrome’s built-in sandboxing features and ensuring that Android OS-level protections such as SELinux policies remain enabled provide additional layers of defense that may hinder exploitation even if a memory corruption flaw is triggered. Regular security audits and continuous monitoring for anomalous behavior on endpoints can also help detect potential attempts to exploit this vulnerability before full compromise occurs, although prevention through patching remains the most effective control against this class of remote code execution threats.