23 October 2026
Reference: CVE-2026-109618
1. What is being reported?
The vulnerability involves how PHP handles out-of-memory errors during web requests. In some cases, this can leave parts of the system in an unstable state, allowing attackers to run harmful code remotely. This flaw is serious enough to allow full control over the affected system if exploited.
2. What this means in plain English
If your organisation uses websites or applications running PHP, this vulnerability could let attackers break in, steal data, or disrupt services. This is especially risky because attackers are already trying to exploit it to install malware.
3. Could this affect a small business?
Small businesses and charities using PHP-based websites or software could be affected if they have not applied the latest updates. Organisations not using PHP or whose IT providers manage updates regularly are less likely to be impacted.
4. What to do now
- Check if your website or applications use PHP and identify the version in use.
- Apply the emergency PHP security patches released after 21 October 2026 immediately.
- Ask your IT provider to confirm that all PHP installations are updated and secure.
- Monitor your systems for unusual activity and report any suspicious behaviour promptly.
5. Ask your IT provider
Has the critical PHP vulnerability CVE-2026-109618 been patched on all our systems, and what steps have been taken to prevent remote code execution attacks?
6. Bottom line
Make sure your PHP software is updated now to stop attackers from taking control of your systems.
Information based on CISA KEV, NVD, and reputable security news reports.