CVE-2026-113152
Summary
by MITRE • 10/21/2026
Memory corruption in SignIn in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as a memory corruption flaw within the SignIn component of Google Chrome prior to version 156.0.8078.47 represents a critical failure in boundary checking and memory management practices during user authentication processes. This defect allows for potential arbitrary code execution by exploiting improper handling of data structures associated with sign-in operations. Although classified as low severity within the Chromium security framework, the nature of memory corruption vulnerabilities inherently poses significant risks because they can be leveraged to bypass sandboxing mechanisms that are designed to isolate browser processes from the underlying operating system. The flaw likely stems from issues such as use-after-free conditions or buffer overflows where user-controlled input is processed without adequate validation before being written into allocated memory regions, leading to heap corruption or stack overflow scenarios depending on the specific implementation details of the SignIn module.
From a technical perspective, this vulnerability falls under the category of CWE-120 Buffer Copy without Checking Size of Input and potentially CWE-416 Use After Free if the issue involves dereferencing pointers after their memory has been released. These types of errors are particularly dangerous in web browsers because they occur within high-level applications that handle untrusted content from the internet. An attacker can craft a malicious HTML page containing specific JavaScript payloads or embedded objects designed to trigger the flawed code path during the sign-in workflow. By manipulating the state of authentication tokens or session data, the attacker forces the browser into an invalid memory state where control flow is redirected to arbitrary shellcode injected via the crafted webpage. This process exploits the timing between allocation and deallocation or exceeds buffer limits to overwrite adjacent memory structures, thereby gaining execution privileges within the context of the compromised renderer process.
The operational impact of this vulnerability extends beyond simple data leakage due to its potential for remote code execution. While modern browsers employ multiple layers of defense including sandboxing, address space layout randomization, and control flow integrity checks, successful exploitation can still lead to a breach in isolation boundaries if combined with other vulnerabilities or specific browser configurations that weaken these protections. An attacker who successfully exploits this flaw could potentially escalate privileges from the restricted renderer process to higher-privileged processes, although achieving full system compromise typically requires chaining multiple vulnerabilities. Nevertheless, even limited code execution within the sandbox can be used for persistent surveillance, credential theft through keylogging scripts injected into legitimate pages, or as a foothold for further lateral movement if additional weaknesses exist in the browser's architecture.
Mitigation strategies primarily involve immediate patching to version 156.0.8078.47 or later where these memory management issues have been resolved by developers through rigorous code review and automated fuzzing tests that target edge cases in authentication modules. Organizations should ensure automatic update mechanisms are enabled for all endpoints running Google Chrome to minimize the window of exposure. Additionally, security teams can implement strict content security policies within their web applications to restrict inline scripts and reduce the attack surface available to attackers attempting to deliver malicious payloads via crafted HTML pages. Monitoring browser telemetry data for unusual memory allocation patterns or crashes related to sign-in components may also help in detecting attempted exploitation activities before they result in successful compromise, aligning with ATT&CK techniques such as T1059 Command and Scripting Interpreter where adversaries use scripts to execute arbitrary code within the victim's environment.