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CVE-2026-109619

High 8.1 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
PHP Stale Internal Request-State Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description

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).

Metrics

CVSS 3.1
8.1 (HIGH) Score source: NVD CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0
9.2 (CRITICAL) Score source: CNA CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS — exploit probability
100% (percentile: 100) as of 1 November 2026
CWE
CWE-416, CWE-755, CWE-824, CWE-1325

Affected products

php: php; siemens: ruggedcom ape1808 firmware; siemens: ruggedcom ape1808; paloaltonetworks: pan-os; paloaltonetworks: panorama m-200; paloaltonetworks: panorama m-300; paloaltonetworks: panorama m-500; paloaltonetworks: panorama m-600; paloaltonetworks: panorama m-700; paloaltonetworks: panorama virtual appliance; paloaltonetworks: wf-500; paloaltonetworks: wf-500-b

References