CVE-2026-79239 in Chrome
Summary
by MITRE • 08/26/2026
Out of bounds read in Tint in Google Chrome on on Android prior to 152.0.7977.65 allowed a remote attacker to potentially read memory inside the sandbox via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an out-of-bounds read within the Tint graphics compiler component of Google Chrome on Android represents a critical boundary condition failure in how input data is processed during rendering operations. This flaw, present in versions prior to 152.0.7977.65, stems from insufficient validation checks when handling shader code or graphical instructions passed through the browser's rendering pipeline. The Tint compiler serves as an intermediate representation layer that translates high-level graphics commands into executable machine code for the device's GPU. When a remote attacker crafts a malicious HTML page containing specially constructed WebGL content or canvas elements, they can trigger this out-of-bounds read condition by supplying input data that exceeds expected buffer limits without proper bounds checking during compilation or execution phases.
From a technical perspective, an out-of-bounds read occurs when the application attempts to access memory locations beyond the allocated boundaries of a specific buffer or array. In the context of Chrome's sandbox architecture, this is particularly dangerous because it allows information leakage from protected memory spaces that should be inaccessible to untrusted web content. The Chromium security team has classified this issue with low severity primarily due to the complexity required to exploit the flaw reliably and the mitigating effects of modern browser sandboxes which restrict direct system access even if memory contents are leaked. However, the potential for reading arbitrary memory inside the sandbox remains a significant concern as it can serve as an information disclosure vector that aids in further exploitation stages such as bypassing address space layout randomization or identifying useful gadgets within shared libraries loaded by the browser process.
The operational impact of this vulnerability centers on unauthorized data exfiltration rather than direct code execution, although it significantly weakens the overall security posture of the browsing environment. An attacker leveraging this flaw could potentially extract sensitive information such as cryptographic keys, session tokens, or internal application state from adjacent memory regions within the same process space. This aligns with Common Weakness Enumeration category CWE-125 which describes out-of-bounds read vulnerabilities that lead to disclosure of protected memory. Furthermore, in terms of attack vectors and techniques, this scenario corresponds to ATT&CK technique T1083 File and Directory Discovery or more specifically the aspect of Memory Scraping where attackers harvest data from volatile memory stores. The use of a crafted HTML page indicates that the initial access vector is remote via web content, falling under network-based exploitation strategies commonly seen in drive-by download attacks or malicious advertising networks.
Mitigation for this vulnerability requires immediate updating to Google Chrome version 152.0.7977.65 or later on Android devices where the patch addresses the boundary checks within the Tint compiler logic. For organizations managing enterprise deployments, enforcing automatic update policies ensures that endpoints remain protected against such memory corruption flaws before they can be weaponized in targeted campaigns. Additionally, defense-in-depth strategies should include enabling strict Content Security Policies to limit the execution of inline scripts and restricting WebGL capabilities where not strictly necessary for business operations. While browser sandboxing provides a robust layer of protection, relying solely on it is insufficient; maintaining up-to-date software versions remains the most effective countermeasure against zero-day exploits that target compiler components like Tint which are frequently updated but also frequently targeted due to their complexity and central role in rendering performance.