GoKawiilPHP 8.6.0 RC4 ships with fixes for two remote code execution bugs
The PHP team released PHP 8.6.0 RC4, the third release candidate in the 8.6 cycle, which patches two critical vulnerabilities that could allow unauthenticated remote code execution. Users running earlier 8.6.0 builds are urged to update immediately, though the team stresses RC4 remains a test build not meant for production use. A further release candidate, RC5, is planned for 5 November 2026.