CVE-2026-16384 in Firefox
Summary
by MITRE • 07/21/2026
Information disclosure due to uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153.
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Analysis
by VulDB Data Team • 07/21/2026
This vulnerability represents a critical information disclosure flaw within Firefox's WebGPU implementation that stems from improper handling of uninitialized memory allocations. The issue occurs when the Graphics WebGPU component processes graphics rendering operations without properly initializing memory regions before use, potentially exposing sensitive data from adjacent memory locations to malicious web applications. Such vulnerabilities fall under the broader category of memory safety issues and are particularly dangerous in graphics rendering contexts where complex memory management operations occur regularly.
The technical exploitation of this vulnerability leverages the fact that uninitialized memory may contain remnants of previous data operations, including cryptographic keys, personal information, or system credentials that were previously stored in those memory locations. When WebGPU API functions process graphics commands, they may inadvertently read from these uninitialized memory regions and expose their contents through various communication channels such as JavaScript APIs or rendering outputs. This type of vulnerability aligns with CWE-457: Use of Uninitialized Variable and represents a classic example of how improper memory initialization can lead to information leakage.
The operational impact of this vulnerability extends beyond simple data exposure, as it could potentially enable attackers to reconstruct sensitive information from the memory dumps that occur during graphics processing. WebGPU is designed for high-performance graphics rendering in web applications, making it a prime target for exploitation since it operates with elevated privileges and direct hardware access capabilities. The vulnerability affects Firefox versions prior to 153 where proper memory initialization practices were not fully implemented in the graphics component. This represents a significant concern for users who rely on Firefox for web browsing activities involving potentially sensitive content or applications that may be exposed to malicious websites.
Security practitioners should prioritize updating Firefox installations to version 153 or later to remediate this vulnerability, as the fix addresses the root cause by ensuring proper memory initialization before graphics operations commence. The mitigation strategy also includes implementing additional security measures such as sandboxing, memory protection mechanisms, and regular security audits of graphics rendering components. Organizations utilizing Firefox for enterprise environments should consider deploying automated update management systems to ensure timely patch deployment. This vulnerability demonstrates the importance of comprehensive memory safety practices in graphics APIs and aligns with ATT&CK technique T1552: Unsecured Credentials, as it represents a method by which attackers can obtain sensitive information through improper memory handling rather than traditional credential theft approaches.
The fix implemented in Firefox 153 specifically addresses the uninitialized memory access patterns within the WebGPU component by introducing proper initialization routines that ensure all memory regions are properly cleared before graphics operations begin. This remediation approach follows industry best practices for memory safety and aligns with security frameworks that emphasize preventing information disclosure through improper resource handling. The vulnerability serves as a reminder of the critical importance of memory management in modern graphics APIs, particularly as web technologies continue to evolve toward more sophisticated rendering capabilities that require extensive memory manipulation operations.