Apple Safari JavaScriptCore HashTable Expansion Integer Overflow Remote Code Execution Vulnerability (CVE-2025-43501)

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple Safari.

User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the handling of HashTable expansion.

The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before writing to memory.

An attacker can leverage this vulnerability to execute code in the context of the current process.

Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-ca/125892

I am one of the editors here at www.systemtek.co.uk I am a UK based technology professional, with an interest in computer security and telecoms.