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# PHP Releases Critical Security Patches for Remote Code Execution Vulnerabilities.
- URL: https://snubmonkey.com/php-critical-rce-security-patches-2026/
- Published: 2026-10-23T00:15:00.000Z
- Updated: 2026-10-23T00:15:01.000Z
- Description: PHP has released critical security updates addressing two remote code execution vulnerabilities that could affect internet-facing servers. Learn which versions are affected, why immediate patching matters, and how to secure your PHP environment.
- Author: SNUBmonkeyteam
- Tags: security 🦾🦿

# 

## PHP Patches Critical RCE Vulnerabilities

On October 21, 2026, the PHP project released security updates addressing two critical vulnerabilities that could allow unauthenticated attackers to execute code on vulnerable servers.

### Remote Code Execution (RCE)

Remote Code Execution (RCE) is a security flaw that allows an attacker to run arbitrary code on a remote system. Depending on the server's configuration and the attacker's level of access, successful exploitation could lead to unauthorized access, data theft, or server compromise.

Both vulnerabilities carry a **CVSS v4.0 score of 9.2**, ([PHP security advisory](https://www.php.net/archive/2026.php?ref=snubmonkey.com)) indicating a critical level of risk. They involve PHP's internal memory management and request-processing mechanisms, potentially allowing malicious requests to exploit weaknesses before application-level security controls can intervene.

Administrators should review the official [PHP security advisory](https://www.php.net/archive/2026.php?ref=snubmonkey.com), identify affected installations, and apply the appropriate security updates promptly.

##   
Which PHP Versions Are Affected?

The security fixes are available in the following releases:

| PHP branch | Fixed version |
| ---------- | ------------- |
| PHP 8.5    | 8.5.12        |
| PHP 8.4    | 8.4.27        |
| PHP 8.3    | 8.3.36        |
| PHP 8.2    | 8.2.35        |

The vulnerabilities are identified as [**CVE-2026-109618**](https://nvd.nist.gov/vuln/detail/cve-2026-109618?ref=snubmonkey.com) and[ **CVE-2026-109619**](https://nvd.nist.gov/vuln/detail/cve-2026-109619?ref=snubmonkey.com) PHP 8.1 and older branches are also affected but no longer receive regular upstream security updates.  
  
## What Are the Vulnerabilities?

The first vulnerability, [CVE-2026-109618](https://nvd.nist.gov/vuln/detail/cve-2026-109618?ref=snubmonkey.com), involves memory corruption during out-of-memory handling. Under certain conditions, PHP may attempt to process incompletely initialized internal data, potentially enabling remote code execution.

The second, [CVE-2026-109619](https://nvd.nist.gov/vuln/detail/cve-2026-109619?ref=snubmonkey.com), involves stale global state that can reference memory after it has been freed. A subsequent request handled by the same worker may encounter this invalid state, potentially allowing an attacker to execute code.

PHP installations serving web requests may be affected, including PHP-FPM, Apache with `mod_php`, `php-cgi`, FrankenPHP and LiteSpeed. The PHP project identifies `mod_php` as a particularly high-risk configuration.  
  
## How to Protect Your Server

Administrators should identify their installed PHP versions and apply the appropriate security updates immediately.

Check the PHP CLI version:

```
$ php -v
```

On Debian or Ubuntu, update the package lists and install available upgrades:

```
$ sudo apt update
$ sudo apt upgrade
```

Then verify the installed version again:

```
$ php -v
```
  
  
**Important**: The CLI version may differ from the PHP runtime serving your website. Check PHP-FPM versions and web-server configuration as well. If you use a third-party repository, container image or manually compiled PHP installation, ensure the actual runtime has received the fix.

After upgrading, restart the relevant PHP-FPM service or web server if required, and verify that the application is running the patched version. If an immediate update is impossible, consider temporarily isolating affected internet-facing services until remediation is complete.

  
For further details, consult the [official PHP security advisory](https://www.php.net/archive/2026.php?ref=snubmonkey.com) and the [CERT-EU security alert](https://cert.europa.eu/publications/security-advisories/2026-018/?ref=snubmonkey.com).

## 

These PHP vulnerabilities demonstrate why prompt security patching is essential for internet-facing infrastructure. Administrators should verify every PHP runtime, install the appropriate fixed release, and confirm that affected services are running updated code. For unsupported PHP branches, plan a migration to a supported version rather than relying on an upstream fix that may never arrive.  
  
We hope this was helpful.  
**Keep learning.** Keep **exploring. Stay secure.**