PHP 8.5.12

CISA Adds PHP2Shell Flaws CVE-2026-109618 and CVE-2026-109619 to KEV Catalog After Confirmed Exploitation

The U.S. Cybersecurity and Infrastructure Security Agency has confirmed active exploitation of two remotely exploitable vulnerabilities in PHP collectively known as PHP2Shell. CVE-2026-109618 stems from improper handling during memory exhaustion, while CVE-2026-109619 involves use-after-free issues in internal state management. Both flaws allow unauthenticated remote code execution and pose elevated risk to any PHP environment processing external requests such as web servers. PHP development teams released patches on October 21 for supported branches including PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35, along with source-level fixes for end-of-life versions 7.4, 8.0 and 8.1. CISA has set a three-day remediation deadline of October 29 for U.S. federal agencies and requires verification that systems have not been compromised.

CISA Urges Immediate Patching of Critical PHP Remote Code Execution Vulnerabilities

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent advisory regarding two severe vulnerabilities in the PHP programming language that allow unauthenticated remote code execution. Identified as CVE-2026-109618 and CVE-2026-109619, the flaws affect all environments processing web requests with PHP and have been nicknamed php2shell. CISA recommends applying patches to PHP 8.5.12, 8.4.27, 8.3.36, or 8.2.35 without delay, or taking affected systems offline if updates cannot be applied immediately. Although no exploitation has been observed yet, organizations are instructed to inventory PHP usage, prioritize internet-facing systems, and monitor for suspicious activity such as shell processes spawned from PHP workers. Web application firewalls may offer partial protection but are not considered a substitute for patching.