Description

Uninitialized resource in V8 in Google Chrome prior to 152.0.7977.75 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-09-02T00:18:27.447Z",
  "pubdate": "2026-09-02T00:18:27.447Z",
  "executiveSummary": "A high-severity vulnerability exists within the V8 JavaScript engine integrated into Google Chrome, stemming from an uninitialized resource condition. This security flaw allows a remote attacker to achieve arbitrary code execution within the confines of the browser's security sandbox.\nThe vulnerability affects versions of Google Chrome prior to 152.0.7977.75. The core issue involves the improper initialization of memory or internal resources during object processing within the V8 engine.\nSuccessful exploitation requires minimal user interaction, typically involving the victim navigating to a specially crafted HTML page. By leveraging the uninitialized resource, an attacker can manipulate memory states to redirect execution flow.\nThe impact is significant, as it enables the execution of arbitrary code within the sandbox environment, posing a critical risk to user data and system integrity. While the sandbox provides a layer of defense, a compromise of the renderer process is a foundational step for further exploitation and potential sandbox escapes.\nThis vulnerability highlights the ongoing complexity of memory management within JIT-compiled JavaScript engines, where even minor oversights in object allocation and initialization can lead to exploitable primitives.",
  "technicalDetails": "The vulnerability resides within the V8 engine's memory management and object lifecycle handling, specifically concerning the allocation and initialization of internal resources. An uninitialized resource condition occurs when the engine allocates space for a data structure or object but fails to properly populate it with valid, expected, or zeroed-out values before it becomes accessible to subsequent operations.\nThe attack flow begins when a remote attacker hosts a crafted HTML page containing malicious JavaScript designed to trigger the specific code path that fails to initialize the resource. When the victim's browser parses this content, the V8 engine executes the vulnerable sequence, resulting in a state where the uninitialized memory segment is treated as a valid object or pointer by the engine.\nBy manipulating heap layouts or leveraging adjacent object allocation patterns, the attacker can influence the contents of the uninitialized memory. This allows the attacker to achieve a 'Use-After-Initialization' or 'Use-Of-Uninitialized-Data' condition, providing a primitive that can be leveraged to corrupt pointers, manipulate vtable entries, or facilitate type confusion. Given the nature of V8's Just-In-Time (JIT) compilation, the attacker can potentially influence the optimizer to produce code that relies on these inconsistent states.\nThe exploitation process typically follows these steps: 1) Heap grooming to stabilize memory layout around the vulnerable object; 2) Triggering the allocation that leaves the resource uninitialized; 3) Filling the uninitialized space with attacker-controlled data (e.g., via typed arrays or object property manipulation); 4) Inducing the engine to use the uninitialized memory, which now contains malicious values; 5) Achieving arbitrary code execution within the renderer process context.\nThis vulnerability is particularly dangerous because it bypasses standard compile-time protections by targeting logic errors in memory state management. Because the execution occurs within the browser sandbox, the initial impact is restricted to the renderer process. However, modern exploit chains often use such renderer exploits as the primary vector to reach further kernel-level or sandbox-escape vulnerabilities. The vulnerability is triggered remotely without requiring authentication or high-level user privileges beyond visiting the malicious page. The impact is limited only by the security boundaries of the Chrome sandbox, which restricts the code from performing unauthorized system calls or accessing sensitive files directly from the compromised renderer process."
}