CVE-2026-109618: RCE via OOM corruption
Out-of-memory handling can leave request data unsafe to clean up.
CVE published 2026-10-21 · Record updated 2026-10-23 · Snapshot checked 24 October 2026
Why this matters
Out-of-memory handling can leave request data unsafe to clean up.
CVSS 4.0: 9.2 (CRITICAL). Source: CVE assigning authority.
A severity score describes the vulnerability, not the probability that your own website has been compromised. Exposure depends on the installed version, configuration and reachable code path.
When to check your system
Unpatched PHP installations serving web requests. Exploitability depends on the runtime and configuration.
How to address it
October fixes: 8.2.35, 8.3.36, 8.4.27, 8.5.12, or a verified vendor backport.
Record the installed package and vendor build, check the advisory’s prerequisites, back up, apply the vendor fix and test the affected site functions. Distribution packages may include backported fixes without changing the upstream version number.
Sources
This page summarises a selected advisory. It is not evidence that a particular website is vulnerable. Where an advisory covers several CVEs, check the linked record for this CVE’s exact affected range.