CVE-2026-109618: PHP Memory Corruption Vulnerability
Summary
A critical memory corruption vulnerability (CVE-2026-109618) has been identified in PHP, potentially allowing unauthenticated remote code execution. CISA is directing stakeholders to apply vendor-provided mitigations and adhere to risk-based patching guidelines, especially for internet-exposed assets.
IFF Assessment
This vulnerability allows for unauthenticated remote code execution, posing a significant risk to systems and data.
Severity
The vulnerability allows for unauthenticated remote code execution in PHP, which is a widely used web development language. This has a high attack vector and significant impact on confidentiality, integrity, and availability.
CISA KEV: Listed as actively exploited. Federal patch due: October 29, 2026. Known ransomware use: Unknown.
Defender Context
This vulnerability in PHP requires immediate attention as it allows for unauthenticated remote code execution. Defenders should prioritize applying any available vendor patches or mitigations and ensure they are following CISA's guidance on prioritizing security updates based on risk. The potential for ransomware use, even if currently unknown, adds another layer of urgency to address this flaw.