The advisory says of exploit reliability: "Additional workers and unrelated traffic can increase the required number of attempts but do not remove the condition. Exploit portability and reliability depend on the PHP build, extensions, frontend behavior and allocator layout."

The exact words it rests on

Additional workers and unrelated traffic can increase the required number of attempts but do not remove the condition. Exploit portability and reliability depend on the PHP build, extensions, frontend behavior and allocator layout.

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