The advisory says of FPM: "FPM exits the child when request startup fails. This prevents consumption of the invalid state and removes the child from the pool. After normal startup, OOM may still be reached in a context failing to account for an early exit, with the invalid state being processed during request shutdown. Source analysis therefore supports FPM as a susceptible, though no complete FPM exploit has been demonstrated for this SAPI."

The exact words it rests on

FPM exits the child when request startup fails. This prevents consumption of the invalid state and removes the child from the pool. After normal startup, OOM may still be reached in a context failing to account for an early exit, with the invalid state being processed during request shutdown. Source analysis therefore supports FPM as a susceptible, though no complete FPM exploit has been demonstrated for this SAPI.

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

The source

GHSA-w8hw-w9fx-j79w: RCE via OOM corruption (CVE-2026-109618)
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