What it is
PHP contains an out-of-memory corruption vulnerability that allows for unauthenticated remote code execution.
What to do
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vendor notices and references
- www.cisa.gov/news-events/alerts/2026/10/21/critical-vulnerabilities-php-require-immediate-
- nvd.nist.gov/vuln/detail/CVE-2026-109618
Description and required action as published by CISA. Full record at NVD.