CVE-2026-95304 in Chrome
Summary
by MITRE • 09/29/2026
Out of bounds write in V8 in Google Chrome prior to 154.0.8037.57 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as an out-of-bounds write within the V8 JavaScript engine represents a critical memory corruption flaw that undermines the integrity of Google Chrome prior to version 154.0.8037.57. This specific type of error occurs when a program writes data beyond the boundaries of a allocated buffer, potentially overwriting adjacent memory locations with arbitrary values. In the context of V8, which is responsible for parsing and executing JavaScript code within Chrome's rendering process, such an flaw can be triggered by maliciously crafted HTML pages containing complex or obfuscated scripts designed to exploit specific edge cases in array handling or object property manipulation. The severity of this issue is classified as High because it directly impacts the core execution environment where web content is processed, providing a direct path for attackers to compromise the browser's security model.
From a technical perspective, out-of-bounds writes are particularly dangerous because they can lead to heap corruption, which allows an attacker to manipulate memory structures such as function pointers or object headers. By carefully crafting input that triggers this condition, a remote attacker can achieve arbitrary code execution within the sandboxed renderer process. This is significant because Chrome employs a multi-process architecture with strict sandboxes designed to isolate web content from the operating system and user data. However, if an out-of-bounds write successfully corrupts memory in a way that allows control over program flow or enables the exploitation of subsequent vulnerabilities like type confusion, it can facilitate escape from this sandbox environment. This escalation would allow the attacker to execute arbitrary code with the privileges of the browser process, potentially leading full system compromise depending on the user's permissions and other security mitigations in place.
The operational impact of this vulnerability is severe for any organization or individual relying on Chrome for secure web browsing. A successful exploit could result in data theft, installation of malware, or use of the infected machine as part of a botnet. Attackers typically distribute such exploits through phishing campaigns, compromised websites, or drive-by downloads where visiting a specific page triggers the malicious script automatically without user interaction beyond loading the page. The existence of this flaw highlights the ongoing challenges in maintaining memory safety within complex engines like V8, which must balance performance with rigorous security checks against increasingly sophisticated attack vectors targeting JavaScript execution contexts.
To mitigate the risks associated with this vulnerability, it is imperative to update Google Chrome to version 154.0.8037.57 or later immediately upon availability. This patch includes fixes for the underlying memory management issues in V8 that allow out-of-bounds writes to occur. Organizations should enforce automated browser updates through their endpoint management solutions to ensure all workstations are protected against known exploits. Additionally, users can employ defense-in-depth strategies such as enabling site isolation features within Chrome, which further restricts how data is shared between different origins and reduces the impact of renderer compromises. Security awareness training regarding suspicious links and untrusted web content remains a vital complementary measure, although technical patching is the primary remediation for this specific memory corruption flaw.
This vulnerability aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-787 Out-of-bounds Write, which describes writing data to a location outside of the intended buffer boundaries. It also relates to ATT&CK techniques involving initial access and execution phases, specifically those leveraging browser vulnerabilities for code execution. The exploitation path typically involves crafting malicious HTML that triggers the memory corruption, followed by heap spraying or other advanced techniques to gain control over program execution flow. Understanding these mappings helps security teams prioritize patching efforts based on industry-standard classifications of vulnerability types and their potential impact on system confidentiality, integrity, and availability.