PHP 8.5.6 / 8.4.21 / 8.3.31 / 8.2.31: What's Actually in the May Security Patch

Mon, 11 May 2026 00:00:00 +0000

On May 7, 2026, the PHP team released simultaneous security updates across all four supported branches: PHP 8.5.6, 8.4.21, 8.3.31, and 8.2.31. The release is classified as a security update for every branch, which means the usual “I’ll get to it next maintenance window” calculus does not apply here. If you run PHP-FPM — and most modern hosting stacks do — there is an XSS vulnerability patched in this release that deserves your attention today.

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PHP 8.5.6 / 8.4.21 / 8.3.31 / 8.2.31: What's Actually in the May Security Patch