Google has released security updates for a zero-day vulnerability in its Chrome browser, identified as CVE-2025-6554. This issue involves a type confusion flaw in the V8 JavaScript and WebAssembly engine, which allows remote attackers to perform arbitrary read/write operations via a crafted HTML page. Type confusion vulnerabilities can lead to unexpected software behavior, enabling the execution of arbitrary code. The flaw was discovered by Clément Lecigne from Google's Threat Analysis Group, indicating potential links to targeted attacks. A configuration change was implemented to mitigate the threat the following day.
Type confusion in V8 in Google Chrome prior to 138.0.7204.96 allowed a remote attacker to perform arbitrary read/write via a crafted HTML page.
Type confusion vulnerabilities can have severe consequences as they can be exploited to trigger unexpected software behavior, resulting in the execution of arbitrary code and program crashes.
Zero-day bugs like this are especially risky because attackers often start using them before a fix is available.
The involvement of Google's Threat Analysis Group often signals that an exploit may be linked to targeted attacks - possibly involving nation-state actors or surveillance operations.
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