CVE-2026-113153 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in SiteIsolation 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: Medium)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as memory corruption within the SiteIsolation component of Google Chrome prior to version 156.0.8078.47 represents a significant breach in the browser's isolation mechanisms, which are critical for maintaining web sandboxing integrity. SiteIsolation is designed to enforce cross-origin isolation by ensuring that each site runs in its own process and memory space, thereby preventing data leakage between different origins. When this mechanism fails due to improper handling of memory operations, it creates a pathway for remote attackers to bypass these security boundaries. The flaw allows an attacker who crafts a malicious HTML page containing specific exploit code to trigger the corruption within the isolated environment. This is not merely a theoretical risk but a practical vector that can be triggered simply by visiting a compromised or specially constructed website, highlighting the importance of robust memory management in browser engines.
From a technical perspective, this issue falls under the category of CWE-120 Buffer Overflow and potentially CWE-787 Out-of-bounds Write depending on the specific nature of the corruption observed during exploitation attempts. The Chromium security team has classified this vulnerability with a Medium severity rating, indicating that while it is serious enough to allow arbitrary code execution within the sandboxed renderer process, it may require certain conditions or user interaction beyond simple page load in some contexts, although the description suggests direct triggering via crafted HTML. In terms of attack taxonomy, this aligns with MITRE ATT&CK technique T1203 Exploitation for Client Execution, where attackers leverage vulnerabilities in client-side software to execute malicious payloads on a victim's machine. The ability to execute arbitrary code inside the sandbox is particularly dangerous because it can lead to further privilege escalation if other security layers are also compromised or bypassed through chained exploits.
The operational impact of this vulnerability extends beyond immediate code execution within the renderer process. If an attacker successfully executes arbitrary code, they gain control over the context in which web content runs, potentially allowing them to access sensitive data stored by websites, such as session cookies, local storage contents, and other user-specific information that is typically protected from cross-origin scripts. Furthermore, successful exploitation could serve as a foothold for more advanced attacks, including drive-by downloads or persistent malware installation if the sandbox escape is achieved in subsequent stages of an attack chain. This undermines the fundamental trust model of web browsing, where users expect their data and identity to remain isolated from malicious actors on untrusted websites.
To mitigate this risk, it is imperative that all users update Google Chrome to version 156.0.8078.47 or later as soon as possible. This patch contains the necessary fixes for the memory corruption issue within SiteIsolation, restoring the integrity of cross-origin isolation policies. Organizations should enforce automated browser updates through their endpoint management solutions to ensure rapid deployment across all workstations and devices. Additionally, security teams should monitor for indicators of compromise related to exploit kits that target this specific vulnerability class, particularly those involving crafted HTML pages designed to trigger memory corruption in older versions of Chromium-based browsers. Regular patching cycles and adherence to vendor-recommended update schedules remain the most effective defense against such remote code execution vulnerabilities.