Vulnerability/
https://seclists.org/oss-sec/2026/q4/401

https://seclists.org/oss-sec/2026/q4/401: PHP 5.4.23 (custom 5.4-5.6) backported patch for PHP2Shell OOM vulnerability (CVE-2026-109618)

Published Oct 27, 2026

Updated

Affected Software

1 affected component

PHP PHP=5.4, =5.5, =5.6

Frequently Asked Questions

Which deployments is the backported patch intended for?

It is intended for legacy PHP 5.4, 5.5, and 5.6 deployments. These versions are described as no longer supported by the upstream PHP team.

Is this an upstream-supported fix?

No. The fix described is a publicly available third-party backport for end-of-life PHP releases, not an upstream-supported update.

What application behavior is the patch intended to protect?

The patch is described as changing PHP's internal memory-allocation model to prevent memory exhaustion and crashes during file-upload progress tracking.

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SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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