CVE-2026-109618

What is CVE-2026-109618?

PHP uses longjmp() for out-of-memory (OOM) errors to exit the current context and abort handling of the request. Some contexts may not properly account for this scenario and leave request memory in an uninitialized state before performing an allocation. The subsequent request cleanup procedure may read or branch on this memory. Multiple OOM strategies can consistently trigger this condition and lead to remote code execution (RCE).

Timeline

• 2026-10-21Published to the U.S. National Vulnerability Database (NVD)
• 2026-10-22First covered in a defend.network daily briefing

Affected product

Php

References

• https://github.com/php/php-src/security/advisories/GHSA-w8hw-w9fx-j79w
• https://www.wiz.io/blog/php2shell-php-rce
• http://www.openwall.com/lists/oss-security/2026/10/21/6
• https://nvd.nist.gov/vuln/detail/CVE-2026-109618

Referenced in our briefings & reports

• Critical RCE exploits: PHP, GitLab, LiteLLM under active attack (2026-10-22)

Related vulnerabilities

• CVE-2026-109619 – Php (same product)
• CVE-2026-69730 – Microsoft Windows 10 1607 (same weakness: CWE-416)
• CVE-2026-68820 – Microsoft Windows Ancillary Function Driver For WinSock (same weakness: CWE-416)
• CVE-2026-53359 – Linux Kernel (same weakness: CWE-416)
• CVE-2026-46242 – Linux Kernel (same weakness: CWE-416)
• CVE-2026-5281 – Google Dawn (same weakness: CWE-416)