Rapid7 says the PHP 8.5 fatal-error backtrace path applies "when fatal_error_backtraces is enabled (the default)". This differs from or adds to other sources: Differs in detail from PHP's advisory GHSA-6wmf-4rv5-p3rp, which says "With `fatal_error_backtraces` enabled" and does not say it is the default.

The exact words it rests on

The advisory confirms RCE against mod_php through PHP 8.5's fatal error backtrace feature, when fatal_error_backtraces is enabled (the default), where a later initialization diagnostic accesses stale backtrace state.

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

The source

CVE-2026-109618 and CVE-2026-109619: Critical unauthenticated remote code execution in PHP
Rapid7 · 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