CVE-2026-76043 in Chrome
Summary
by MITRE • 08/19/2026
Incorrect calculation in V8 in Google Chrome prior to 151.0.7922.169 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 • 08/19/2026
The vulnerability identified as an incorrect calculation within the V8 JavaScript engine of Google Chrome prior to version 151.0.7922.169 represents a critical memory safety flaw that undermines the browser's sandboxing mechanisms. This issue stems from a logical error in how the engine handles arithmetic operations or array indexing, which can lead to out-of-bounds access conditions during script execution. Such miscalculations are particularly dangerous because they allow an attacker to manipulate internal data structures beyond their allocated memory boundaries, effectively bypassing the isolation layers designed to contain malicious code within a restricted environment.
From a technical perspective, this flaw aligns with CWE-190, which describes integer overflow or wraparound errors that can lead to buffer overflows when used for size calculations or index bounds checking. When V8 processes a crafted HTML page containing specific JavaScript payloads, the erroneous calculation results in an invalid memory address being accessed or written to. This condition enables arbitrary code execution within the context of the renderer process. Although Chrome employs multiple layers of defense including sandboxing and ASLR, the successful exploitation of this vulnerability allows the attacker to escape these protections by leveraging the corrupted state of the V8 heap or stack structures to gain control over program flow.
The operational impact of this vulnerability is severe due to its potential for remote code execution without user interaction beyond visiting a malicious webpage. An attacker could craft a specially designed HTML page that, when loaded in an affected version of Chrome, triggers the calculation error and subsequently executes arbitrary commands on the victim's system. This capability facilitates a wide range of attacks including data theft, installation of malware, or using the compromised machine as part of a botnet. The severity is classified as High by Chromium security standards because it directly compromises the integrity and confidentiality of user systems through standard web browsing activities.
This vulnerability maps to MITRE ATT&CK technique T1203, which covers Exploitation for Client Execution, specifically within the context of browser-based attacks. It also relates to CWE-787, an out-of-bounds write condition that occurs when a program writes data beyond the boundaries of allocated memory. The exploitation path typically involves crafting JavaScript code that forces V8 into a state where it performs invalid memory operations, leading to privilege escalation from the sandboxed renderer process to higher-level system privileges or at least full control over the browser's runtime environment.
Mitigation for this vulnerability requires immediate action by updating Google Chrome to version 151.0.7922.169 or later where these calculation errors have been corrected and validated through rigorous testing. Organizations should enforce automatic update policies to ensure all endpoints are running patched versions of the browser. Additionally, security teams can implement application control solutions that restrict the execution of untrusted scripts in high-risk environments and utilize network monitoring tools to detect anomalous traffic patterns associated with exploit attempts targeting known vulnerabilities in web browsers. Regular vulnerability assessments and patch management cycles are essential to maintaining a secure posture against such memory corruption flaws.