Researchers from VUSec and Scuola Superiore Sant'Anna have identified a new variant of the Spectre vulnerability, known as Branch Target Reuse (BTR). This variant specifically targets Just-In-Time (JIT) engines found in web browsers, programming language runtimes, and even the operating system kernel. Affected systems span multiple CPU vendors, which raises concerns for a wide range of software and hardware users. This discovery is significant because it shows that even with existing defenses against Spectre, new methods can still leak sensitive information from memory. As these vulnerabilities can potentially expose user data, it's crucial for companies and developers to remain vigilant and update their systems as necessary.