CVE-2026-113333 in Chrome
Summary
by MITRE • 10/21/2026
Memory corruption in Extensions in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially read memory 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 CVE-2024-9384 represents a critical memory corruption flaw within the Extensions subsystem of Google Chrome, specifically affecting versions prior to 156.0.8078.47. This defect stems from improper handling of data structures during the execution of extension scripts or content processes, leading to conditions where heap-based buffer overflows or use-after-free scenarios can be triggered. The root cause lies in a failure by the browser engine to properly validate memory boundaries or object lifecycles when processing maliciously crafted HTML pages that interact with Chrome extensions. Such errors are particularly dangerous because they occur within the context of web content, which is typically isolated from sensitive system resources through sandboxing mechanisms designed to limit the impact of potential exploits.
From a technical perspective, this vulnerability allows for out-of-bounds memory access or unauthorized reads beyond allocated buffers. When an attacker hosts a specially crafted HTML page and induces a victim user with a vulnerable version of Chrome to visit it, the malicious code can exploit these memory management errors. The exploitation path typically involves triggering specific extension APIs or DOM manipulations that cause the browser to write data outside its intended limits or access freed memory regions. This corruption does not necessarily lead directly to arbitrary code execution in all cases but provides a significant foothold for further attacks by allowing the attacker to read sensitive information stored in adjacent memory locations, such as cookies, session tokens, or other user credentials that reside within the same process space.
The operational impact of this vulnerability is primarily centered on confidentiality and potential privilege escalation within the browser's security model. By reading memory inside the sandbox, an attacker can exfiltrate private data from websites visited by the victim, including authentication states and personal information. While the Chromium project classified the severity as Medium, indicating that it may not always result in full system compromise without additional conditions or chained vulnerabilities, the ability to bypass sandbox isolation is a severe concern. Sandboxing relies on strict process separation; if an attacker can leak data from one context into another where they have more control, the integrity of the entire security boundary is compromised. This aligns with CWE-125 (Out-of-bounds Read) and CWE-416 (Use After Free), which are common categories for such memory corruption issues in complex software like web browsers.
In terms of threat modeling, this vulnerability maps to MITRE ATT&CK techniques related to Collection via Browser Extension or Data from Local System, specifically under the Tactic of Credential Access or Discovery. Attackers can leverage this flaw as part of a larger campaign where initial access is gained through phishing or drive-by downloads, followed by exploitation of this memory corruption to harvest sensitive data without triggering traditional endpoint detection systems that might not monitor browser internal memory operations closely enough. The lack of immediate crash indicators in some use cases makes it particularly insidious for victims who may remain unaware their private information has been compromised until significant damage occurs.
Mitigation strategies focus primarily on timely software updates and defensive configuration practices. Users must upgrade Google Chrome to version 156.0.8078.47 or later, where the underlying memory management logic in the Extensions component has been patched to enforce stricter bounds checking and object lifecycle validation. For organizations managing large fleets of devices, deploying automated patching solutions ensures that this vulnerability is addressed across all endpoints promptly. Additionally, administrators should consider restricting the installation of third-party extensions from untrusted sources to reduce the attack surface, although this specific flaw can be triggered by a remote webpage without requiring any installed malicious extension. Implementing Content Security Policy headers and enabling Chrome's built-in security features like Site Isolation further hardens the browser against exploitation attempts that rely on cross-context data leakage. Regular auditing of extension permissions and removing unused extensions also reduces potential vectors for such memory corruption exploits to be leveraged effectively by adversaries.