CVE-2026-95332 in Chrome
Summary
by MITRE • 09/29/2026
Use of uninitialized variable in Tint in Google Chrome on on Android prior to 154.0.8037.57 allowed a remote attacker to read memory outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as an uninitialized variable usage within the Tint shader compiler component of Google Chrome on Android represents a significant class of logic errors that can lead to severe security consequences. This flaw, which was addressed in version 154.0.8037.57, stems from a failure by the software to properly initialize memory locations before they are read or utilized during the compilation process for graphics shaders. In high-performance computing environments like browser-based rendering engines, variables must be explicitly assigned default values upon declaration to prevent them from containing residual data left over from previous operations. When this initialization step is omitted, the variable retains whatever value was previously stored in that memory address, leading to unpredictable and undefined behavior during execution.
From a technical perspective, Tint serves as the shader compiler for Chromium-based browsers, translating high-level shading languages into machine code or intermediate representations suitable for GPU processing. The uninitialized variable likely influenced control flow decisions, array indexing calculations, or buffer size determinations within this compilation pipeline. Because the value of an uninitialized integer is non-deterministic, it may result in out-of-bounds memory access patterns when passed to lower-level graphics APIs such as Vulkan or OpenGL ES. This specific failure mode aligns with Common Weakness Enumeration category CWE-457, which defines use of a variable that has not been initialized. Such errors are particularly dangerous because they can manifest differently across different devices, operating system states, and GPU architectures, making them difficult to reproduce consistently but highly exploitable under the right conditions.
The operational impact of this vulnerability is categorized as medium severity by Chromium security standards due to its potential for sandbox escape. While many memory corruption bugs in browsers are contained within isolated renderer processes, an uninitialized variable leading to out-of-bounds reads can allow a remote attacker to leak sensitive information from outside the browser's sandbox boundaries. By crafting a malicious HTML page that triggers specific shader compilation paths with carefully constructed inputs, an attacker could potentially read arbitrary memory locations on the user device. This capability enables data exfiltration attacks where confidential documents, authentication tokens, or other private user data residing in adjacent memory spaces can be extracted and transmitted to a remote server controlled by the adversary.
This type of exploit leverages techniques consistent with MITRE ATT&CK tactic T1059, specifically command and script interpreter sub-techniques if it leads further into exploitation, but more directly relates to discovery tactics such as T1082 System Information Discovery or data exfiltration methods like T1041 Exfiltration Over C2 Channel. The attack vector is classified as remote because the vulnerability can be triggered simply by visiting a maliciously crafted webpage without requiring any user interaction beyond loading the page itself. This passive execution model makes it particularly dangerous in phishing campaigns where users are tricked into accessing compromised websites that host the exploit code embedded within WebGL or WebGPU contexts.
Mitigation for this issue primarily relies on applying the latest security patches provided by Google through automatic updates to Chrome and Android system components. Users should ensure their devices are running version 154.0.8037.57 or later, which includes fixes that enforce strict initialization protocols within the Tint compiler logic. For developers integrating similar graphics libraries, it is critical to implement static analysis tools capable of detecting uninitialized variable usage and to adopt defensive programming practices such as zeroing out memory buffers before use. Additionally, enabling sandbox enforcement mechanisms and keeping operating system kernels up to date can help limit the blast radius should a similar vulnerability be discovered in other components of the software stack.