EIP-2026-103500

This exploit leverages a bug in V8's RegExp constructor initialization where 'expected_nof_properties' is not set, leading to an out-of-bounds (OOB) write via incorrect calculation of 'unused_property_fields' in JSFunction::GetDerivedMap. The PoC demonstrates OOB write by constructing a derived RegExp class with a syntax error to skip property count compilation.