CVE-2026-119268 in Chrome
Summary
by MITRE • 10/30/2026
Integer overflow in Editing in Google Chrome prior to 156.0.8078.79 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/30/2026
The vulnerability identified as an integer overflow within the editing component of Google Chrome prior to version 156.0.8078.79 represents a critical memory safety flaw that undermines the browser's sandboxing mechanisms. This specific defect arises when arithmetic operations involving buffer sizes or array indices exceed the maximum value representable by the allocated data type, typically resulting in a wrap-around effect where large positive values are interpreted as small negative numbers or significantly smaller positive integers. In the context of web browsers, such miscalculations frequently occur during memory allocation routines or bounds checking logic within the rendering engine's handling of rich text editing operations. When an attacker crafts a malicious HTML page that triggers this overflow condition, the browser may allocate insufficient memory for a buffer while subsequently writing data based on the original, larger intended size. This discrepancy leads to a heap-based buffer overread or overwrite, allowing arbitrary data to be written adjacent to the allocated object in memory.
The operational impact of this vulnerability is severe due to its potential for remote code execution within the browser's sandboxed environment. Modern browsers employ strict process isolation and sandboxing techniques designed to limit the damage caused by exploits originating from untrusted web content. However, an integer overflow that results in out-of-bounds memory access can be leveraged to corrupt critical data structures such as function pointers or virtual table entries. By carefully crafting the payload within the crafted HTML page, a remote attacker can achieve arbitrary read and write primitives, which are essential steps for bypassing sandbox protections. Once these low-level memory corruption techniques succeed, the attacker can execute arbitrary code with the privileges of the browser process, potentially leading to full system compromise if additional exploitation chains are employed to escape the sandbox entirely.
From a classification perspective, this vulnerability aligns closely with CWE-190, which defines integer overflow or wraparound when performing arithmetic operations. This category encompasses scenarios where signed integers are used in contexts that expect unsigned values, or where addition results exceed the maximum limit of the data type without proper validation. Furthermore, the exploitation technique falls under MITRE ATT&CK techniques related to memory corruption and sandbox escape, specifically leveraging heap-based buffer overflows to gain code execution privileges. The high severity rating assigned by Chromium reflects the direct path this flaw provides from a user visiting a malicious webpage to achieving arbitrary code execution, highlighting the critical nature of maintaining robust input validation and arithmetic safety checks within core browser components like the editing subsystem.
Mitigation strategies for this vulnerability primarily involve updating Google Chrome to version 156.0.8078.79 or later, where the underlying integer overflow has been patched through improved bounds checking and type-safe arithmetic operations. For organizations unable to immediately patch all endpoints, implementing network-level controls such as web filtering proxies can help block access to known malicious domains hosting exploit kits designed for this vulnerability. Additionally, enabling advanced security features like site isolation ensures that even if an attacker successfully exploits the memory corruption flaw, they are confined to a low-privilege process with limited ability to interact with other tabs or sensitive data. Regular monitoring of browser update notifications and enforcing automated patch management policies remain essential practices to mitigate exposure to such high-severity vulnerabilities in widely used web browsers.