Memory Corruption Vulnerability
Exploited in the wild. CISA added it to its Known Exploited Vulnerabilities list on 26 Oct 2026.
over99.9%
Reading the vendor advisory
Fix it in your code
Each opens with a short prompt that points at Global Hack Map's public runbook for CVE-2026-109618. Nothing runs until you send it.
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).
You are affected if
The fix