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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.

Security NEXTTranslated from Japanese

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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two PHP vulnerabilities collectively referred to as PHP2Shell to its Known Exploited Vulnerabilities catalog after confirming real-world exploitation.

The flaws, tracked as CVE-2026-109618 and CVE-2026-109619, permit unauthenticated remote code execution. CVE-2026-109618 arises from insufficient memory handling during resource exhaustion, while CVE-2026-109619 results from improper management of internal state after memory has been freed. Both issues are especially dangerous in PHP deployments that accept external requests, including web applications and APIs.

On October 21 the PHP development team published official updates that resolve the vulnerabilities: PHP 8.5.12, PHP 8.4.27, PHP 8.3.36 and PHP 8.2.35. Source-level patches were also supplied for the unsupported branches PHP 7.4, PHP 8.0 and PHP 8.1, and several Linux distributions have begun back-porting the fixes.

CISA set a strict compliance deadline of October 29 for U.S. federal agencies, requiring both installation of patches and confirmation that no prior compromise has occurred. Organizations running any affected PHP version are urged to apply updates immediately and review logs for signs of exploitation.

CVE-2026-109618CVE-2026-109619PHP2ShellPHP 8.5.12
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