CVE-2026-93377 in Chrome
Summary
by MITRE • 09/18/2026
Type confusion in V8 in Google Chrome prior to 153.0.8010.52 allowed a remote attacker leveraging social engineering to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified as a type confusion issue within the V8 JavaScript engine, which powers Google Chrome prior to version 153.0.8010.52, represents a critical failure in memory safety and runtime type checking mechanisms. Type confusions occur when an application incorrectly interprets the data type of a value stored in memory, leading to operations being performed on incompatible types. In the context of V8, this flaw allows for arbitrary read or write access within the JavaScript heap, which serves as the foundation for executing script code. The severity is classified as High by Chromium security standards because it bypasses fundamental sandboxing protections that are designed to isolate untrusted web content from the host operating system and user data.
The technical mechanism behind this vulnerability involves a mismatch between how V8 tracks object types during Just-In-Time compilation or interpretation phases versus how those objects are actually accessed at runtime. When an attacker crafts a specific HTML page containing malicious JavaScript, they can manipulate variable states to trigger a scenario where the engine assumes one type for a memory region while it holds another. This discrepancy enables the execution of arbitrary code within the browser's sandboxed environment. The exploitation typically requires precise heap grooming and careful manipulation of object layouts to ensure that the corrupted pointer or misinterpreted data leads to controlled memory writes, which can then be leveraged to achieve arbitrary code execution.
From an operational perspective, this vulnerability poses a significant risk because it facilitates remote code execution through social engineering tactics. An attacker does not need direct access to the victim's machine but instead relies on tricking the user into visiting a malicious website or opening a compromised document that contains the crafted HTML payload. Once executed, the arbitrary code runs with the privileges of the browser process, which can lead to further exploitation steps such as sandbox escapes, data exfiltration, or installation of persistent malware. The reliance on social engineering highlights the importance of user awareness alongside technical controls, although the primary mitigation lies in patching the underlying engine flaw rather than relying solely on behavioral defenses.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 153.0.8010.52 or later immediately upon availability. This update contains patches for the V8 type confusion logic error, restoring proper type checking and memory isolation boundaries. Additionally, implementing application whitelisting and restricting script execution in untrusted zones can provide an additional layer of defense against such exploits. Security teams should also monitor for indicators of compromise associated with known exploitation kits that target this specific vulnerability class.
This incident aligns with Common Weakness Enumeration (CWE) category CWE-843, which refers to Accessing Memory Location using Incorrect Reference Type. It is also closely related to CWE-120, Buffer Overflow without Description of Boundary, as type confusions often lead to out-of-bounds memory accesses that facilitate code execution. In the context of the MITRE ATT&CK framework, this vulnerability supports techniques under Tactic TA0004: Privilege Escalation and specifically relates to technique T1203: Exploitation for Client Execution, where attackers leverage software vulnerabilities in client-side applications to gain initial access or escalate privileges within a constrained environment. The successful exploitation of such flaws underscores the continuous need for rigorous static analysis, fuzzing, and formal verification methods in browser engine development to prevent similar memory safety issues from reaching production releases.