The advisory says of session upload progress under mod_php and FPM: "With mod_php, both the producing operation and fatal error can occur during multipart startup. FPM terminates a child when this startup fails, so that exact sequence does not survive. The validated FPM path instead publishes state during application execution after successful startup, reaches a fatal error, and then uses session upload progress as the early consumer. It works with a normal dynamic FPM pool, although it depends on a suitable application operation."

The exact words it rests on

With mod_php, both the producing operation and fatal error can occur during multipart startup. FPM terminates a child when this startup fails, so that exact sequence does not survive. The validated FPM path instead publishes state during application execution after successful startup, reaches a fatal error, and then uses session upload progress as the early consumer. It works with a normal dynamic FPM pool, although it depends on a suitable application operation.

What the source said when we opened it, on 23 Oct 2026.

The source

GHSA-6wmf-4rv5-p3rp: RCE via stale global state (CVE-2026-109619)
PHP project (php-src security advisories) · 2026-10-21

Open the sourcearchived copy

Checked

Checked by the notis newsroom on 23 Oct 2026, against the source above.

In the story

PHP patches two critical remote code execution flaws 23 Oct 2026