CVE-2026-109619
HIGH severity · CVSS 8.1 · Use-after-free · actively exploited (CISA KEV)
8.1CVSS HIGH exploited
Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2026-10-26. US federal agencies must patch by 2026-10-29.
What to do: read the PHP “php2shell” RCE (CVE-2026-109618/109619): what to do now — a step-by-step remediation runbook.
Summary
PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The global state may then refer to request memory even after it has been freed. Subsequent requests may read or branch on this stale state before it is fully initialized. Multiple strategies can trigger this condition and produce remote code execution (RCE).
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)100%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (2)
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://github.com/php/php-src/security/advisories/GHSA-6wmf-4rv5-p3rpAdvisory
- http://www.openwall.com/lists/oss-security/2026/10/21/16Advisory
- http://www.openwall.com/lists/oss-security/2026/10/21/17Advisory
- http://www.openwall.com/lists/oss-security/2026/10/21/23Advisory
- http://www.openwall.com/lists/oss-security/2026/10/21/7Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/14Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/15Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/16Advisory