CVE-2026-106332 in Chrome
Summary
by MITRE • 10/07/2026
Integer overflow in Compositing in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to obtain cross-origin data via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an integer overflow within the compositing subsystem of Google Chrome represents a critical failure in memory management logic during the rendering pipeline. This specific flaw occurs when calculating buffer sizes or offsets for visual elements, where arithmetic operations involving user-controlled values exceed the maximum limit representable by the allocated data type. In the context of browser architecture, the compositor is responsible for assembling layers and painting them to the screen. When an integer overflow happens in this phase, it can lead to a heap-based buffer overread or write condition because the system allocates memory based on the incorrect, truncated size rather than the actual required amount. This discrepancy allows data structures that should be isolated within their own boundaries to overlap with adjacent memory regions, creating a pathway for unauthorized access to sensitive information stored in those neighboring areas.
From an operational perspective, this vulnerability enables cross-origin data theft through a crafted HTML page hosted on a malicious website. An attacker can construct a webpage containing specific JavaScript and CSS elements designed to trigger the overflow condition within Chrome's rendering engine. By carefully manipulating the dimensions or properties of these elements, the attacker forces the browser into a state where it reads memory contents outside the intended scope of the current document. Since modern browsers enforce strict same-origin policies to prevent scripts from accessing data across different domains, this integer overflow effectively bypasses those security controls. The result is that an attacker can exfiltrate sensitive information such as cookies, session tokens, or private form data belonging to other websites visited by the user in the same browser instance, leading to a severe compromise of confidentiality and potentially facilitating further account takeover attacks.
This flaw aligns with Common Weakness Enumeration (CWE) category CWE-190, which defines integer overflow or wraparound errors that occur when an arithmetic operation exceeds the maximum value for a given data type. Furthermore, in terms of tactical classification under the MITRE ATT&CK framework, this vulnerability facilitates Initial Access and Collection techniques specifically related to Client-side Scripting and Browser Security Bypasses. The exploitation vector is classified as remote because it requires no user interaction beyond visiting a malicious site, making it particularly dangerous for users who may inadvertently navigate to compromised or phishing pages.
Mitigation strategies primarily involve updating the browser software to version 155.0.8059.39 or later, where Google has implemented stricter bounds checking and validation logic within the compositing code path to prevent arithmetic overflows from propagating into memory allocation decisions. For organizations managing large fleets of endpoints, deploying automated patch management solutions is essential to ensure timely application of these security updates. Additionally, users should enable automatic update notifications for their browsers to minimize the window of exposure between vulnerability disclosure and remediation. Security teams can also monitor network traffic for unusual data exfiltration patterns that might indicate successful exploitation attempts in environments where immediate patching is not yet feasible.